################################################################################
#                                                                              #
#                             XCompose-STEM                                    #
#                                                                              #
#       Easy Unicode Symbols on Linux for STEM Professionals                  #
#                                                                              #
################################################################################
#
# XCompose configuration providing keyboard shortcuts for mathematical
# notation, Greek letters, arrows, and scientific typography.
#
# Author:        Phil Bowens
# License:       MIT License
# Repository:    https://github.com/phil-bowens/xcompose-stem
# Documentation: https://phil-bowens.github.io/xcompose-stem/
#
# DESCRIPTION:
# This is a personal XCompose configuration, maintained for my own use and
# shared as a reference implementation. It provides systematic keyboard
# shortcuts for Unicode symbols commonly used in STEM fields.
#
# REQUIREMENTS:
# - Linux with X11 or Wayland + XCompose support
# - Compose key configured (CAPS, Right Alt, Menu key, etc.)
#
# INSTALLATION:
# - Automated: make install # (preserves existing sequences)
# - Manual: include "/path/to/this/XCompose" in ~/.XCompose
# - Details: See README.md
#
#                   ╭──────────────────────────────────╮
#                   │  Copyright (c) 2025 Phil Bowens  │
################################################################################

########################################################################
# DESIGN PHILOSOPHY & USER GUIDE
########################################################################
# This XCompose configuration is designed for power users in STEM fields,
# programming, and typography. It balances memorability with comprehensive
# coverage using cognitive design principles.
#
# HOW TO LEARN THIS SYSTEM (recommended progression):
#
# 1: Start with ASCII shortcuts (zero memorization needed)
#   These mirror conventions you already know from programming:
#   -> ← => ≤ >= != ~= +- ** :- := ... --- --. "< >" 1/2 3/4
#
# 2: Learn the 5 main prefix families (fits in working memory)
#   <g> = Greek letters    (α β γ δ)
#   <h> = Higher math      (∀ ∃ ∫ ∇ → ⇒ ∈ ⊂)
#   <k> = Keyboard/UI      (⌘ ⌥ □ ☑)
#   <p> = Phonetic/IPA     (ə ɛ ʃ θ)
#   <b> = Box-drawing      (┌ ├ ═)
#   That's it. You now know how to find 95% of symbols.
#
# 3: Learn mnemonic suffixes as needed
#   The suffix tells you what it is:
#   <h><i><f><f> = "iff" = if-and-only-if ⇔
#   <h><l><e><q> = "leq" = less-than-or-equal ≤
#   <h><f> = "forall" = ∀
#   <g><a> = "alpha" = α
#   When you forget, you can GUESS based on the abbreviation.
#
# Cognitive Rationale:
#
# 1. SIMPLE MENTAL MODEL (5 prefixes, not 20)
#    Problem: If we split <h> into <a>(arrows), <s>(sets), <l>(logic),
#             <c>(calculus), you'd need to remember which category each
#             symbol belongs to. Is ∇ calculus or vector ops? Is ⊥ logic
#             or geometry?
#    Solution: ONE prefix <h> = "math-y stuff", then the SUFFIX is the
#             mnemonic. You only remember 5 top-level categories.
#
# 2. TWO-TIER HIERARCHY
#    Tier 1 (typing): Simple prefix → <h> for math, <g> for Greek
#    Tier 2 (browsing): Visual sections with ## headers for scanning
#    The file has detailed subsections, but you don't need to memorize
#    the organization—just browse when exploring.
#
# 3. SELF-DOCUMENTING MNEMONICS
#    <h><d><e><l> = ∂ (partial DELta)
#    <h><S><U> = ∑ (big Sigma for SUm)
#    <h><i><m><p><l> = ⇒ (IMPLies)
#    You can reconstruct forgotten sequences from first principles.
#
# COMPLETE PREFIX REFERENCE:
# - <g> = Greek letters (α, β, γ, δ, ε, ζ, etc.)
# - <h> = Higher math/logic/sets/arrows/calculus (∀, ∃, ∫, ∇, ⊕, ⊗, →, ⇒, etc.)
#   - Includes astronomy/cosmology (☉, ♂, ♀, ★, ′, ″)
#   - Subsections: Arithmetic, Arrows, Logic, Sets, Calculus (for browsing)
# - <b> = Box-drawing (┌, ├, ═, ╔, etc.)
# - <k> = Keyboard & UI glyphs (⌘, ⌥, ⌃, ⇧, ℓ, ℒ, ℝ, □, ☑, ○, ▲, etc.)
#   - Includes calligraphic/Fraktur fonts and documentation shapes
# - <p> = Phonetic/IPA (ə, ɛ, ɪ, ʃ, θ, etc.)
# - <u> = Music/tune (♪, ♫, ♭, ♯, etc.)
# - <i> = International diacritics (á, é, ñ, ü, etc.) [minimal - use dead keys]
# - Avoids 'M' and <space> prefixes to prevent conflicts with Omarchy's bindings (emoji menu, etc.)
#
# FULL ASCII SHORTCUT REFERENCE:
#
# ARROWS (programming/math conventions):
#   ->                     →   Rightwards arrow
#   <-                     ←   Leftwards arrow
#   <>                     ↔   Bidirectional arrow
#   =>                     ⇒   Implies (double arrow right)
#   <=>                    ⇔   If and only if (double arrow both)
#   ^^^                    ↑   Upwards arrow
#   vv                     ↓   Downwards arrow
#
# RELATIONS (every language uses these):
#   <=                     ≤   Less than or equal
#   >=                     ≥   Greater than or equal
#   !=                     ≠   Not equal
#   ~=                     ≈   Approximately equal
#   -~                     ≃   Asymptotically equal
#
# OPERATORS (intuitive combos):
#   +-                     ±   Plus-minus
#   **                     ×   Multiplication
#   :-                     ÷   Division
#   :=                     ≔   Colon equals (definition)
#   ...                    …   Ellipsis
#
# TYPOGRAPHY (common patterns):
#   ---                    —   Em dash
#   --.                    –   En dash
#   "<                     "   Left double quote
#   >"                     "   Right double quote
#   <<" and >>"            « » Guillemets
#   <, and >,              ‹ › Single guillemets
#
# FRACTIONS (natural digits):
#   1/2, 1/3, 2/3, 1/4, 3/4, 1/5, 1/8, 3/8, 5/8, 7/8
#   → ½ ⅓ ⅔ ¼ ¾ ⅕ ⅛ ⅜ ⅝ ⅞
#
# TIME-SAVING TIPS:
# - Common symbols have BOTH Iconic/ASCII and Mnemonic/Symbolic variants (use whichever you remember)
# - When in doubt, try the obvious abbreviation: <h><i><f><f> for iff really works
# - The validator (validate_xcompose.py) prevents conflicts—experiment freely
#
# SYSTEM INTEGRATION:
# - Optimized for US QWERTY keyboard layout (all keys easily reachable)
# - Short sequences (2-4 keys) for speed
# - Where possible, system defaults are preserved, but this is not a rule
# - Supplements (not replaces) dead keys for international diacritics
# - Compatible with standard Compose (preserves î, ā, « », etc.)
# - Wayland/Hyprland: Works via XWayland (restart ibus/fcitx if needed)
#
# IMPORTANT ERGONOMIC CHOICE - Subscript/Macron Swap:
# - Standard Compose: _a → ā (macron), __a → undefined
# - This config: _a → ₐ (subscript), __a → ā (macron)
# - Rationale: Subscripts 100x more common in STEM (x₁, aₙ, etc.)
# - Matches LaTeX convention (x_a for subscripts)
# - Macrons still accessible, just one extra keystroke
# - See SUPERSCRIPTS & SUBSCRIPTS section for full coverage
#
# DOMAIN COVERAGE:
# - ML/AI: ∇ (gradient), · (dot product), ∥ (norms), ℒ (loss), σ (sigmoid),
#          ⊗ (tensor product), ℙ ℝ ℂ (spaces), ∂ (partial)
# - Physics: ℏ (ℏ-bar), Å (angstrom), Ω (ohm), ° (degree), ′ ″ (arcmin/arcsec)
# - Chemistry: ⇌ ↽ ⇁ (equilibrium arrows)
# - Logic: ∀ ∃ ⊢ ⊨ ⊩ → ⇒ ∧ ∨ ¬ (full predicate logic)
# - Typography: — – " " « » ‹ › … (professional publishing)
#
########################################################################

########################################################################
# IMPORTANT - Comment Format:
# All sequence definitions MUST follow this format:
#   <Multi_key> <keys> : "symbol" UXXXX  # [TYPE] Description
#
# Where TYPE is one of: [ICONIC] [MNEMONIC]
#
# This format is required by validation and documentation generation tools.
# Do not deviate from this format or scripts will fail to parse sequences.
#
########################################################################

########################################################################
# GREEK LETTERS  (prefix: g) — Greek alphabet symbols
########################################################################

# lowercase
<Multi_key> <g> <a> : "α" U03B1  # [MNEMONIC] Greek small letter alpha
<Multi_key> <g> <b> : "β" U03B2  # [MNEMONIC] Greek small letter beta
<Multi_key> <g> <g> : "γ" U03B3  # [MNEMONIC] Greek small letter gamma
<Multi_key> <g> <d> : "δ" U03B4  # [MNEMONIC] Greek small letter delta
<Multi_key> <g> <e> : "ε" U03B5  # [MNEMONIC] Greek small letter epsilon
<Multi_key> <g> <z> : "ζ" U03B6  # [MNEMONIC] Greek small letter zeta
<Multi_key> <g> <h> : "η" U03B7  # [MNEMONIC] Greek small letter eta
<Multi_key> <g> <t> : "θ" U03B8  # [MNEMONIC] Greek small letter theta
<Multi_key> <g> <i> : "ι" U03B9  # [MNEMONIC] Greek small letter iota
<Multi_key> <g> <k> : "κ" U03BA  # [MNEMONIC] Greek small letter kappa
<Multi_key> <g> <l> : "λ" U03BB  # [MNEMONIC] Greek small letter lambda
<Multi_key> <g> <m> : "μ" U03BC  # [MNEMONIC] Greek small letter mu
<Multi_key> <g> <n> : "ν" U03BD  # [MNEMONIC] Greek small letter nu
<Multi_key> <g> <x> : "ξ" U03BE  # [MNEMONIC] Greek small letter xi
<Multi_key> <g> <o> : "ο" U03BF  # [MNEMONIC] Greek small letter omicron
<Multi_key> <g> <p> : "π" U03C0  # [MNEMONIC] Greek small letter pi
<Multi_key> <g> <r> : "ρ" U03C1  # [MNEMONIC] Greek small letter rho
<Multi_key> <g> <s> : "σ" U03C3  # [MNEMONIC] Greek small letter sigma
<Multi_key> <g> <f> : "φ" U03C6  # [MNEMONIC] Greek small letter phi
<Multi_key> <g> <c> : "χ" U03C7  # [MNEMONIC] Greek small letter chi
<Multi_key> <g> <y> : "ψ" U03C8  # [MNEMONIC] Greek small letter psi
<Multi_key> <g> <w> : "ω" U03C9  # [MNEMONIC] Greek small letter omega
<Multi_key> <g> <period> <s> : "ς" U03C2  # [MNEMONIC] Greek small letter final sigma

# uppercase
<Multi_key> <g> <A> : "Α" U0391  # [MNEMONIC] Greek capital letter Alpha
<Multi_key> <g> <B> : "Β" U0392  # [MNEMONIC] Greek capital letter Beta
<Multi_key> <g> <G> : "Γ" U0393  # [MNEMONIC] Greek capital letter Gamma
<Multi_key> <g> <D> : "Δ" U0394  # [MNEMONIC] Greek capital letter Delta
<Multi_key> <g> <E> : "Ε" U0395  # [MNEMONIC] Greek capital letter Epsilon
<Multi_key> <g> <Z> : "Ζ" U0396  # [MNEMONIC] Greek capital letter Zeta
<Multi_key> <g> <H> : "Η" U0397  # [MNEMONIC] Greek capital letter Eta
<Multi_key> <g> <T> : "Θ" U0398  # [MNEMONIC] Greek capital letter Theta
<Multi_key> <g> <I> : "Ι" U0399  # [MNEMONIC] Greek capital letter Iota
<Multi_key> <g> <K> : "Κ" U039A  # [MNEMONIC] Greek capital letter Kappa
<Multi_key> <g> <L> : "Λ" U039B  # [MNEMONIC] Greek capital letter Lambda
<Multi_key> <g> <M> : "Μ" U039C  # [MNEMONIC] Greek capital letter Mu
<Multi_key> <g> <N> : "Ν" U039D  # [MNEMONIC] Greek capital letter Nu
<Multi_key> <g> <X> : "Ξ" U039E  # [MNEMONIC] Greek capital letter Xi
<Multi_key> <g> <O> : "Ο" U039F  # [MNEMONIC] Greek capital letter Omicron
<Multi_key> <g> <P> : "Π" U03A0  # [MNEMONIC] Greek capital letter Pi
<Multi_key> <g> <R> : "Ρ" U03A1  # [MNEMONIC] Greek capital letter Rho
<Multi_key> <g> <S> : "Σ" U03A3  # [MNEMONIC] Greek capital letter Sigma
<Multi_key> <g> <F> : "Φ" U03A6  # [MNEMONIC] Greek capital letter Phi
<Multi_key> <g> <C> : "Χ" U03A7  # [MNEMONIC] Greek capital letter Chi
<Multi_key> <g> <Y> : "Ψ" U03A8  # [MNEMONIC] Greek capital letter Psi
<Multi_key> <g> <W> : "Ω" U03A9  # [MNEMONIC] Greek capital letter Omega

# optional tonos accents with apostrophe
<Multi_key> <g> <apostrophe> <a> : "ά" U03AC  # [MNEMONIC] Greek small letter alpha with tonos
<Multi_key> <g> <apostrophe> <e> : "έ" U03AD  # [MNEMONIC] Greek small letter epsilon with tonos
<Multi_key> <g> <apostrophe> <h> : "ή" U03AE  # [MNEMONIC] Greek small letter eta with tonos
<Multi_key> <g> <apostrophe> <i> : "ί" U03AF  # [MNEMONIC] Greek small letter iota with tonos
<Multi_key> <g> <apostrophe> <o> : "ό" U03CC    # [MNEMONIC] Greek small letter omicron with tonos
<Multi_key> <g> <apostrophe> <y> : "ύ" U03CD    # [MNEMONIC] Greek small letter upsilon with tonos
<Multi_key> <g> <apostrophe> <w> : "ώ" U03CE    # [MNEMONIC] Greek small letter omega with tonos

########################################################################
# MATH / LOGIC / SETS  (prefix: h) — avoids 'm' (emoji) conflicts
########################################################################
# This section includes both ASCII shortcuts (fast) and <h> prefix
# mnemonics (discoverable). Use whichever style fits your workflow.

## ARITHMETIC & RELATIONS
# ASCII shortcuts: <= >= != ~= +- ** :- := etc.
<Multi_key> <plus> <minus> : "±" U00B1    # [ICONIC] Plus-minus sign
<Multi_key> <asterisk> <asterisk> : "×" U00D7    # [ICONIC] Multiplication sign
<Multi_key> <colon> <minus> : "÷" U00F7    # [ICONIC] Division sign
<Multi_key> <h> <d> <i> <v> : "÷" U00F7    # [MNEMONIC] Division (mnemonic)
<Multi_key> <h> <l> <t> : "<" U003C    # [MNEMONIC] Less than
<Multi_key> <h> <g> <t> : ">" U003E    # [MNEMONIC] Greater than
<Multi_key> <less> <equal> : "≤" U2264    # [ICONIC] Less-than or equal to
<Multi_key> <h> <l> <e> <q> : "≤" U2264    # [MNEMONIC] Less-than or equal to (mnemonic)
<Multi_key> <greater> <equal> : "≥" U2265    # [ICONIC] Greater-than or equal to
<Multi_key> <h> <g> <e> <q> : "≥" U2265    # [MNEMONIC] Greater-than or equal to (mnemonic)
<Multi_key> <exclam> <equal> : "≠" U2260    # [ICONIC] Not equal to
<Multi_key> <h> <n> <e> <q> : "≠" U2260    # [MNEMONIC] Not equal to (mnemonic)
<Multi_key> <asciitilde> <equal> : "≈" U2248    # [ICONIC] Approximately equal to
<Multi_key> <minus> <asciitilde> : "≃" U2243    # [ICONIC] Asymptotically equal to
<Multi_key> <period> <asciitilde> <equal> : "≐" U2250    # [ICONIC] Approaches the limit
<Multi_key> <colon> <equal> : "≔" U2254    # [ICONIC] Colon equals
<Multi_key> <equal> <colon> : "≕" U2255    # [ICONIC] Equals colon
<Multi_key> <less> <less> <less> : "≪" U226A    # [ICONIC] Much less-than (visual: <<<)
<Multi_key> <h> <m> <l> <t> : "≪" U226A    # [MNEMONIC] Much less-than (mnemonic: hmlt)
<Multi_key> <greater> <greater> <greater> : "≫" U226B    # [ICONIC] Much greater-than (visual: >>>)
<Multi_key> <h> <m> <g> <t> : "≫" U226B    # [MNEMONIC] Much greater-than (mnemonic: hmgt)
<Multi_key> <less> <asciitilde> : "≺" U227A    # [ICONIC] Precedes
<Multi_key> <asciitilde> <greater> : "≻" U227B    # [ICONIC] Succeeds
<Multi_key> <h> <j> <o> <i> <n> : "⋈" U22C8    # [MNEMONIC] Bowtie (join operator)
<Multi_key> <greater> <less> : "⋈" U22C8    # [ICONIC] Bowtie (join operator, visual mnemonic)

## ARROWS
# ASCII shortcuts: -> <- <> => <= ^^ vv etc.
# Mnemonics: <h><l><e><f><t> <h><i><m><p><l> <h><i><f><f> etc.
<Multi_key> <minus> <greater> : "→" U2192    # [ICONIC] Rightwards arrow
<Multi_key> <less> <minus> : "←" U2190    # [ICONIC] Leftwards arrow
<Multi_key> <less> <greater> : "↔" U2194    # [ICONIC] Left right arrow
<Multi_key> <equal> <greater> : "⇒" U21D2    # [ICONIC] Rightwards double arrow (implies)
<Multi_key> <bar> <less> <less> : "⇐" U21D0    # [ICONIC] Leftwards double arrow (visual: |<<)
<Multi_key> <bar> <greater> <greater> : "⇒" U21D2    # [ICONIC] Rightwards double arrow (visual: |>>)
<Multi_key> <equal> <less> <greater> : "⇔" U21D4    # [ICONIC] Left right double arrow (iff)
<Multi_key> <equal> <asciicircum> : "⇑" U21D1    # [ICONIC] Upwards double arrow
<Multi_key> <equal> <v> : "⇓" U21D3    # [ICONIC] Downwards double arrow
<Multi_key> <asciicircum> <asciicircum> <asciicircum> : "↑" U2191    # [ICONIC] Upwards arrow
<Multi_key> <v> <v> : "↓" U2193    # [ICONIC] Downwards arrow
# mnemonic alternatives (prefix: h)
<Multi_key> <h> <u> <p> : "↑" U2191    # [MNEMONIC] Upwards arrow (mnemonic: up)
<Multi_key> <h> <d> <o> <w> <n> : "↓" U2193    # [MNEMONIC] Downwards arrow (mnemonic: down)
<Multi_key> <h> <l> <e> <f> <t> : "←" U2190    # [MNEMONIC] Leftwards arrow (mnemonic: left)
<Multi_key> <h> <i> <m> <p> <l> : "⇒" U21D2    # [MNEMONIC] Implies (mnemonic: impl)
<Multi_key> <h> <i> <f> <f> : "⇔" U21D4    # [MNEMONIC] If and only if (mnemonic: iff)
<Multi_key> <h> <d> <u> <p> : "⇑" U21D1    # [MNEMONIC] Double up arrow (mnemonic: dup)
<Multi_key> <h> <u> <d> : "↕" U2195    # [MNEMONIC] Up-down arrow (mnemonic: ud)
<Multi_key> <h> <d> <a> <u> <r> : "↗" U2197    # [MNEMONIC] North-east arrow (diagonal arrow up-right)
<Multi_key> <h> <d> <a> <d> <r> : "↘" U2198    # [MNEMONIC] South-east arrow (diagonal arrow down-right)
<Multi_key> <h> <d> <a> <u> <l> : "↖" U2196    # [MNEMONIC] North-west arrow (diagonal arrow up-left)
<Multi_key> <h> <d> <a> <d> <l> : "↙" U2199    # [MNEMONIC] South-west arrow (diagonal arrow down-left)
<Multi_key> <h> <v> <a> <r> : "➔" U2794    # [MNEMONIC] Heavy wide-headed rightwards arrow (v=heavy)
<Multi_key> <h> <v> <a> <l> : "⬅" U2B05    # [MNEMONIC] Heavy leftwards arrow (v=heavy)
<Multi_key> <h> <v> <r> <a> : "➜" U279C    # [MNEMONIC] Heavy round-tipped rightwards arrow (v=heavy)
<Multi_key> <h> <v> <c> <a> : "➙" U2799    # [MNEMONIC] Heavy rightwards arrow chevron (v=heavy)

## LOGIC
# All use <h> prefix for consistency
# Includes: ∧ (and), ∨ (or), ¬ (not), ∀ (forall), ∃ (exists), etc.
<Multi_key> <h> <n> <o> <t> : "¬" U00AC    # [MNEMONIC] Not sign
<Multi_key> <h> <a> : "∧" U2227    # [MNEMONIC] Logical and
<Multi_key> <h> <o> : "∨" U2228    # [MNEMONIC] Logical or
<Multi_key> <h> <exclam> <a> : "⊼" U22BC    # [MNEMONIC] NAND (Sheffer stroke)
<Multi_key> <h> <exclam> <o> : "⊽" U22BD    # [MNEMONIC] NOR (Peirce arrow)
<Multi_key> <h> <f> : "∀" U2200    # [MNEMONIC] For all
<Multi_key> <h> <E> : "∃" U2203    # [MNEMONIC] There exists
<Multi_key> <exclam> <h> <E> : "∄" U2204    # [ICONIC] There does not exist
<Multi_key> <h> <x> <o> : "⊕" U2295    # [MNEMONIC] Circled plus (XOR)
<Multi_key> <h> <x> <m> : "⊖" U2296    # [MNEMONIC] Circled minus
<Multi_key> <h> <t> <e> : "⊗" U2297    # [MNEMONIC] Circled times (tensor product)
<Multi_key> <h> <x> <d> : "⊘" U2298    # [MNEMONIC] Circled division slash

## SET THEORY
# All use <h> prefix for consistency
# Includes: ∅ (empty), ∪ (union), ∩ (intersection), ∈ (element of), etc.
<Multi_key> <h> <0> : "∅" U2205    # [MNEMONIC] Empty set
<Multi_key> <h> <U> : "∪" U222A    # [MNEMONIC] Union
<Multi_key> <h> <I> : "∩" U2229    # [MNEMONIC] Intersection
<Multi_key> <h> <s> <b> : "⊂" U2282    # [MNEMONIC] Subset of (strict)
<Multi_key> <h> <s> <p> : "⊃" U2283    # [MNEMONIC] Superset of (strict)
<Multi_key> <h> <s> <e> <b> : "⊆" U2286    # [MNEMONIC] Subset or equal to
<Multi_key> <h> <s> <e> <p> : "⊇" U2287    # [MNEMONIC] Superset or equal to
<Multi_key> <exclam> <h> <s> <b> : "⊄" U2284    # [MNEMONIC] Not a subset of
<Multi_key> <exclam> <h> <s> <p> : "⊅" U2285    # [MNEMONIC] Not a superset of
<Multi_key> <exclam> <h> <s> <e> <b> : "⊈" U2288    # [MNEMONIC] Not subset or equal to
<Multi_key> <exclam> <h> <s> <e> <p> : "⊉" U2289    # [MNEMONIC] Not superset or equal to
<Multi_key> <h> <e> : "∈" U2208    # [MNEMONIC] Element of
<Multi_key> <h> <i> <n> : "∈" U2208    # [MNEMONIC] Element of
<Multi_key> <exclam> <h> <e> : "∉" U2209    # [MNEMONIC] Not an element of
<Multi_key> <h> <n> <i> : "∋" U220B    # [MNEMONIC] Contains as member (ni = reverse of "in")
<Multi_key> <exclam> <h> <n> <i> : "∌" U220C    # [MNEMONIC] Does not contain as member
<Multi_key> <h> <N> : "ℕ" U2115    # [MNEMONIC] Double-struck capital N (natural numbers)
<Multi_key> <h> <Z> : "ℤ" U2124    # [MNEMONIC] Double-struck capital Z (integers)
<Multi_key> <h> <Q> : "ℚ" U211A    # [MNEMONIC] Double-struck capital Q (rationals)
<Multi_key> <h> <R> : "ℝ" U211D    # [MNEMONIC] Double-struck capital R (reals)
<Multi_key> <h> <C> : "ℂ" U2102    # [MNEMONIC] Double-struck capital C (complex numbers)
<Multi_key> <h> <P> <o> : "℘" U2118    # [MNEMONIC] Script capital P (power set)

## CALCULUS & OPERATORS
# All use <h> prefix for consistency
# Includes: ∂ (partial), ∇ (nabla), ∫ (integral), ∑ (sum), ∏ (product), etc.
<Multi_key> <d> <slash> : "∂" U2202    # [ICONIC] Partial differential (visual: d with slash)
<Multi_key> <h> <d> <e> <l> : "∂" U2202    # [MNEMONIC] Partial differential (mnemonic: del)
<Multi_key> <h> <D> : "∇" U2207    # [MNEMONIC] Nabla
<Multi_key> <h> <i> <t> : "∫" U222B    # [MNEMONIC] Integral
<Multi_key> <h> <i> <2> : "∬" U222C    # [MNEMONIC] Double integral
<Multi_key> <h> <i> <3> : "∭" U222D    # [MNEMONIC] Triple integral
<Multi_key> <h> <i> <c> : "∮" U222E    # [MNEMONIC] Contour integral
<Multi_key> <h> <S> <U> : "∑" U2211    # [MNEMONIC] N-ary summation
<Multi_key> <h> <P> <n> : "∏" U220F    # [MNEMONIC] N-ary product
<Multi_key> <h> <c> <o> : "∘" U2218    # [MNEMONIC] Ring operator (function composition: f∘g)

## MISC MATH & SYMBOLS
# All use <h> prefix for consistency
# Includes: ∞ (infinity), ∥ (parallel), ⊥ (perpendicular), card suits, etc.
<Multi_key> <h> <8> : "∞" U221E    # [MNEMONIC] Infinity
<Multi_key> <h> <bar> <bar> : "∥" U2225    # [MNEMONIC] Parallel to
<Multi_key> <exclam> <h> <bar> <bar> : "∦" U2226    # [MNEMONIC] Not parallel to
<Multi_key> <h> <bar> <v> : "∣" U2223    # [MNEMONIC] Divides
<Multi_key> <exclam> <h> <bar> <v> : "∤" U2224    # [MNEMONIC] Does not divide
<Multi_key> <h> <period> : "·" U00B7    # [MNEMONIC] Middle dot operator
<Multi_key> <slash> <v> : "√" U221A    # [ICONIC] Square root (visual: check mark / V shape)
<Multi_key> <h> <s> <q> <r> <t> : "√" U221A    # [MNEMONIC] Square root (mnemonic: sqrt)
<Multi_key> <3> <slash> <v> : "∛" U221B    # [ICONIC] Cube root (visual: 3rd root, extends /v pattern)
<Multi_key> <h> <c> <b> <r> <t> : "∛" U221B    # [MNEMONIC] Cube root (mnemonic: cbrt)
<Multi_key> <h> <A> <N> : "∠" U2220    # [MNEMONIC] Angle
<Multi_key> <h> <p> : "⊥" U22A5    # [MNEMONIC] Perpendicular
<Multi_key> <period> <period> <colon> : "∴" U2234    # [ICONIC] Therefore (three dots in triangle)
<Multi_key> <colon> <period> <period> : "∵" U2235    # [ICONIC] Because (inverted therefore)
<Multi_key> <equal> <asciitilde> <equal> : "≡" U2261    # [ICONIC] Identical to / Equivalent to
<Multi_key> <exclam> <asciitilde> <equal> : "≢" U2262    # [ICONIC] Not identical to
<Multi_key> <h> <P> <R> : "∝" U221D    # [MNEMONIC] Proportional to
<Multi_key> <h> <q> <e> : "∎" U220E    # [MNEMONIC] End of proof (QED)
<Multi_key> <h> <P> <r> : "ℙ" U2119    # [MNEMONIC] Double-struck capital P (primes)
<Multi_key> <h> <H> : "ℍ" U210D    # [MNEMONIC] Double-struck capital H (quaternions)
<Multi_key> <h> <b> <A> : "𝐀" U1D400    # [MNEMONIC] Bold capital A (font-dependent)
<Multi_key> <h> <bracketleft> : "⎡" U23A1    # [MNEMONIC] Left square bracket upper corner (for matrices)
<Multi_key> <h> <bracketright> : "⎤" U23A4    # [MNEMONIC] Right square bracket upper corner (for matrices)
<Multi_key> <h> <c> <p> : "∐" U2210    # [MNEMONIC] N-ary coproduct
<Multi_key> <h> <t> <o> : "⊤" U22A4    # [MNEMONIC] Down tack (top)
<Multi_key> <h> <b> <o> : "⊥" U22A5    # [MNEMONIC] Up tack (bottom)
<Multi_key> <h> <s> <P> : "⊊" U228A    # [MNEMONIC] Proper subset of (strict)
<Multi_key> <h> <S> <p> : "⊋" U228B    # [MNEMONIC] Proper superset of (strict)
<Multi_key> <h> <l> <l> : "ℓ" U2113    # [MNEMONIC] Script small l (liters, length)
<Multi_key> <period> <period> <minus> : "⋯" U22EF    # [ICONIC] Midline horizontal ellipsis
<Multi_key> <h> <b> <p> <s> : "‱" U2031    # [MNEMONIC] Per ten thousand (basis points)

## COMMON FRACTIONS
# ASCII shortcuts: 1/2, 1/3, 2/3, 1/4, 3/4, 1/5, 1/8
<Multi_key> <1> <slash> <2> : "½" U00BD    # [ICONIC] Vulgar fraction one half
<Multi_key> <1> <slash> <3> : "⅓" U2153    # [ICONIC] Vulgar fraction one third
<Multi_key> <2> <slash> <3> : "⅔" U2154    # [ICONIC] Vulgar fraction two thirds
<Multi_key> <1> <slash> <4> : "¼" U00BC    # [ICONIC] Vulgar fraction one quarter
<Multi_key> <3> <slash> <4> : "¾" U00BE    # [ICONIC] Vulgar fraction three quarters
<Multi_key> <1> <slash> <5> : "⅕" U2155    # [ICONIC] Vulgar fraction one fifth
<Multi_key> <1> <slash> <8> : "⅛" U215B    # [ICONIC] Vulgar fraction one eighth
<Multi_key> <3> <slash> <8> : "⅜" U215C    # [ICONIC] Vulgar fraction three eighths
<Multi_key> <5> <slash> <8> : "⅝" U215D    # [ICONIC] Vulgar fraction five eighths
<Multi_key> <7> <slash> <8> : "⅞" U215E    # [ICONIC] Vulgar fraction seven eighths

## ADDITIONAL SYMBOLS
# Miscellaneous useful symbols (checkmarks, bullets, card suits, specialized arrows)
<Multi_key> <period> <minus> <less> : "⇠" U21E0    # [ICONIC] Leftwards dashed arrow
<Multi_key> <period> <minus> <greater> : "⇢" U21E2    # [ICONIC] Rightwards dashed arrow
<Multi_key> <h> <c> <w> : "↷" U21B7    # [MNEMONIC] Clockwise top semicircle arrow
<Multi_key> <h> <c> <c> <w> : "↶" U21B6    # [MNEMONIC] Counterclockwise top semicircle arrow
<Multi_key> <v> <period> <v> : "✓" U2713    # [ICONIC] Check mark
<Multi_key> <x> <x> <x> : "✗" U2717    # [MNEMONIC] Ballot X
<Multi_key> <period> <asterisk> : "•" U2022    # [ICONIC] Bullet
<Multi_key> <k> <asterisk> <s> : "♠" U2660    # [MNEMONIC] Spade suit
<Multi_key> <k> <asterisk> <h> : "♥" U2665    # [MNEMONIC] Heart suit
<Multi_key> <k> <asterisk> <d> : "♦" U2666    # [MNEMONIC] Diamond suit
<Multi_key> <k> <asterisk> <c> : "♣" U2663    # [MNEMONIC] Club suit

########################################################################
# HIGHER LOGIC / CATEGORY THEORY / LONG ARROWS  (prefix: h) — Advanced mathematical logic and category theory notation
########################################################################

## TURNSTILES & ENTAILMENT
# Used in formal logic, proof theory, type theory
# Includes: ⊢ (provable), ⊨ (models), ⊩ (forces), and negated variants
<Multi_key> <h> <t> <r> : "⊢" U22A2    # [MNEMONIC] Right tack (provable)
<Multi_key> <h> <t> <l> : "⊣" U22A3    # [MNEMONIC] Left tack
<Multi_key> <h> <t> <t> : "⊫" U22AB    # [MNEMONIC] Double turnstile
<Multi_key> <h> <m> <o> : "⊨" U22A8    # [MNEMONIC] Models (semantic entailment)
<Multi_key> <h> <m> <v> : "⊧" U22A7    # [MNEMONIC] Models (alternative)
<Multi_key> <h> <F> <R> : "⊩" U22A9    # [MNEMONIC] Forces (forcing)
# negated variants
<Multi_key> <exclam> <h> <t> <r> : "⊬" U22AC    # [MNEMONIC] Not provable
<Multi_key> <exclam> <h> <m> <o> : "⊭" U22AD    # [MNEMONIC] Not models
<Multi_key> <exclam> <h> <t> <t> : "⊮" U22AE    # [MNEMONIC] Not double turnstile
<Multi_key> <exclam> <h> <f> <r> : "⊯" U22AF    # [MNEMONIC] Not forces

## LONG IMPLICATION ARROWS
# Extended versions of ⇒ ⇐ ⇔ for formal logic and type theory
# ASCII shortcuts: ===>, |==, >|<
# Mnemonics: <h><l><i><m><p> <h><l><i><m><b> <h><l><i><f><f>
<Multi_key> <equal> <equal> <equal> <greater> : "⟹" U27F9    # [ICONIC] Long implies
<Multi_key> <bar> <equal> <equal> : "⟸" U27F8    # [ICONIC] Long implied by
<Multi_key> <greater> <bar> <less> : "⟺" U27FA    # [ICONIC] Long iff
# mnemonic alternatives (prefix: h)
<Multi_key> <h> <l> <i> <m> <p> : "⟹" U27F9    # [MNEMONIC] Long implies (mnemonic: limp)
<Multi_key> <h> <l> <i> <m> <b> : "⟸" U27F8    # [MNEMONIC] Long implied by (mnemonic: limb)
<Multi_key> <h> <l> <i> <f> <f> : "⟺" U27FA    # [MNEMONIC] Long iff (mnemonic: liff)

## LONG PLAIN ARROWS
# Extended versions of → ← ↔ for category diagrams and commutative diagrams
# ASCII shortcuts: ||>, ||<, ||->
# Mnemonics: <h><l><a><r> <h><l><a><l> <h><l><a><b>
<Multi_key> <bar> <bar> <greater> : "⟶" U27F6    # [ICONIC] Long rightwards arrow
<Multi_key> <bar> <bar> <less> : "⟵" U27F5    # [ICONIC] Long leftwards arrow
<Multi_key> <bar> <bar> <minus> <greater> : "⟷" U27F7    # [ICONIC] Long left right arrow
# mnemonic alternatives (prefix: h l)
<Multi_key> <h> <l> <a> <r> : "⟶" U27F6    # [MNEMONIC] Long arrow right (mnemonic: lar)
<Multi_key> <h> <l> <a> <l> : "⟵" U27F5    # [MNEMONIC] Long arrow left (mnemonic: lal)
<Multi_key> <h> <l> <a> <b> : "⟷" U27F7    # [MNEMONIC] Long arrow both (mnemonic: lab)

## CATEGORY THEORY ARROWS
# Specialized arrows for category theory, type theory, and abstract algebra
# Includes: ↦ (mapsto), ↪ (mono/injection), ↠ (epi/surjection), ≅ (isomorphism)
<Multi_key> <h> <m> <s> : "↦" U21A6    # [MNEMONIC] Rightwards arrow from bar (mapsto)
<Multi_key> <h> <j> <n> : "↪" U21AA    # [MNEMONIC] Rightwards arrow with hook (injection)
<Multi_key> <greater> <bar> <greater> : "↠" U21A0    # [ICONIC] Rightwards two-headed arrow (surjection/epi)
<Multi_key> <I> <S> : "≅" U2245    # [MNEMONIC] Approximately equal to (isomorphism)
<Multi_key> <h> <t> <a> : "↣" U21A3    # [MNEMONIC] Rightwards arrow with tail
<Multi_key> <h> <h> <r> : "⇝" U21DD    # [MNEMONIC] Rightwards squiggle arrow
# mnemonic alternatives (prefix: h)
<Multi_key> <h> <s> <u> <r> : "↠" U21A0    # [MNEMONIC] Surjection/epi (mnemonic: sur)
<Multi_key> <h> <i> <s> <o> <m> : "≅" U2245    # [MNEMONIC] Isomorphism (mnemonic: isom)

# long mapsto
<Multi_key> <h> <l> <m> <s> : "⟼" U27FC    # [MNEMONIC] Long mapsto (mnemonic: lms)

########################################################################
# SUPERSCRIPTS & SUBSCRIPTS (prefix: ^ _) — digits, signs, parens, common letters
########################################################################

# superscripts 0–9, + - = ( )
<Multi_key> <asciicircum> <0> : "⁰" U2070    # [ICONIC] Superscript zero
<Multi_key> <asciicircum> <1> : "¹" U00B9    # [ICONIC] Superscript one
<Multi_key> <asciicircum> <2> : "²" U00B2    # [ICONIC] Superscript two
<Multi_key> <asciicircum> <3> : "³" U00B3    # [ICONIC] Superscript three
<Multi_key> <asciicircum> <4> : "⁴" U2074    # [ICONIC] Superscript four
<Multi_key> <asciicircum> <5> : "⁵" U2075    # [ICONIC] Superscript five
<Multi_key> <asciicircum> <6> : "⁶" U2076    # [ICONIC] Superscript six
<Multi_key> <asciicircum> <7> : "⁷" U2077    # [ICONIC] Superscript seven
<Multi_key> <asciicircum> <8> : "⁸" U2078    # [ICONIC] Superscript eight
<Multi_key> <asciicircum> <9> : "⁹" U2079    # [ICONIC] Superscript nine
<Multi_key> <asciicircum> <plus> : "⁺" U207A    # [ICONIC] Superscript plus
<Multi_key> <asciicircum> <minus> : "⁻" U207B    # [ICONIC] Superscript minus
<Multi_key> <asciicircum> <equal> : "⁼" U207C    # [ICONIC] Superscript equals
<Multi_key> <asciicircum> <parenleft> : "⁽" U207D    # [ICONIC] Superscript left parenthesis
<Multi_key> <asciicircum> <parenright> : "⁾" U207E    # [ICONIC] Superscript right parenthesis
# superscript letters (all available lowercase letters for scientific notation)
<Multi_key> <asciicircum> <a> : "ᵃ" U1D43    # [ICONIC] Superscript a
<Multi_key> <asciicircum> <b> : "ᵇ" U1D47    # [ICONIC] Superscript b
<Multi_key> <asciicircum> <c> : "ᶜ" U1D9C    # [ICONIC] Superscript c
<Multi_key> <asciicircum> <d> : "ᵈ" U1D48    # [ICONIC] Superscript d
<Multi_key> <asciicircum> <e> : "ᵉ" U1D49    # [ICONIC] Superscript e
<Multi_key> <asciicircum> <f> : "ᶠ" U1DA0    # [ICONIC] Superscript f
<Multi_key> <asciicircum> <g> : "ᵍ" U1D4D    # [ICONIC] Superscript g
<Multi_key> <asciicircum> <h> : "ʰ" U02B0    # [ICONIC] Superscript h
<Multi_key> <asciicircum> <i> : "ⁱ" U2071    # [ICONIC] Superscript i
<Multi_key> <asciicircum> <j> : "ʲ" U02B2    # [ICONIC] Superscript j
<Multi_key> <asciicircum> <k> : "ᵏ" U1D4F    # [ICONIC] Superscript k
<Multi_key> <asciicircum> <l> : "ˡ" U02E1    # [ICONIC] Superscript l
<Multi_key> <asciicircum> <m> : "ᵐ" U1D50    # [ICONIC] Superscript m
<Multi_key> <asciicircum> <n> : "ⁿ" U207F    # [ICONIC] Superscript n
<Multi_key> <asciicircum> <o> : "ᵒ" U1D52    # [ICONIC] Superscript o
<Multi_key> <asciicircum> <p> : "ᵖ" U1D56    # [ICONIC] Superscript p
<Multi_key> <asciicircum> <r> : "ʳ" U02B3    # [ICONIC] Superscript r
<Multi_key> <asciicircum> <s> : "ˢ" U02E2    # [ICONIC] Superscript s
<Multi_key> <asciicircum> <t> : "ᵗ" U1D57    # [ICONIC] Superscript t
<Multi_key> <asciicircum> <u> : "ᵘ" U1D58    # [ICONIC] Superscript u
<Multi_key> <asciicircum> <v> : "ᵛ" U1D5B    # [ICONIC] Superscript v
<Multi_key> <asciicircum> <w> : "ʷ" U02B7    # [ICONIC] Superscript w
<Multi_key> <asciicircum> <x> : "ˣ" U02E3    # [ICONIC] Superscript x
<Multi_key> <asciicircum> <y> : "ʸ" U02B8    # [ICONIC] Superscript y
<Multi_key> <asciicircum> <z> : "ᶻ" U1DBB    # [ICONIC] Superscript z

# subscripts 0–9, + - = ( )
<Multi_key> <underscore> <0> : "₀" U2080    # [ICONIC] Subscript zero
<Multi_key> <underscore> <1> : "₁" U2081    # [ICONIC] Subscript one
<Multi_key> <underscore> <2> : "₂" U2082    # [ICONIC] Subscript two
<Multi_key> <underscore> <3> : "₃" U2083    # [ICONIC] Subscript three
<Multi_key> <underscore> <4> : "₄" U2084    # [ICONIC] Subscript four
<Multi_key> <underscore> <5> : "₅" U2085    # [ICONIC] Subscript five
<Multi_key> <underscore> <6> : "₆" U2086    # [ICONIC] Subscript six
<Multi_key> <underscore> <7> : "₇" U2087    # [ICONIC] Subscript seven
<Multi_key> <underscore> <8> : "₈" U2088    # [ICONIC] Subscript eight
<Multi_key> <underscore> <9> : "₉" U2089    # [ICONIC] Subscript nine
<Multi_key> <underscore> <plus> : "₊" U208A    # [ICONIC] Subscript plus
<Multi_key> <underscore> <minus> : "₋" U208B    # [ICONIC] Subscript minus
<Multi_key> <underscore> <equal> : "₌" U208C    # [ICONIC] Subscript equals
<Multi_key> <underscore> <parenleft> : "₍" U208D    # [ICONIC] Subscript left parenthesis
<Multi_key> <underscore> <parenright> : "₎" U208E    # [ICONIC] Subscript right parenthesis
# subscript letters available in Unicode (single underscore for subscripts)
<Multi_key> <underscore> <a> : "ₐ" U2090    # [ICONIC] Subscript a
<Multi_key> <underscore> <e> : "ₑ" U2091    # [ICONIC] Subscript e
<Multi_key> <underscore> <o> : "ₒ" U2092    # [ICONIC] Subscript o
# MACRONS: Double underscore (ergonomic choice - subscripts more common than macrons)
# Standard Compose uses _a for macron, but we swap it for subscripts (LaTeX convention)
# Macrons still accessible via __ instead of _
<Multi_key> <underscore> <underscore> <a> : "ā" U0101    # [ICONIC] a with macron
<Multi_key> <underscore> <underscore> <e> : "ē" U0113    # [ICONIC] e with macron
<Multi_key> <underscore> <underscore> <o> : "ō" U014D    # [ICONIC] o with macron
<Multi_key> <underscore> <h> : "ₕ" U2095    # [ICONIC] Subscript h
<Multi_key> <underscore> <i> : "ᵢ" U1D62    # [ICONIC] Subscript i
<Multi_key> <underscore> <j> : "ⱼ" U2C7C    # [ICONIC] Subscript j
<Multi_key> <underscore> <k> : "ₖ" U2096    # [ICONIC] Subscript k
<Multi_key> <underscore> <l> : "ₗ" U2097    # [ICONIC] Subscript l
<Multi_key> <underscore> <m> : "ₘ" U2098    # [ICONIC] Subscript m
<Multi_key> <underscore> <n> : "ₙ" U2099    # [ICONIC] Subscript n
<Multi_key> <underscore> <p> : "ₚ" U209A    # [ICONIC] Subscript p
<Multi_key> <underscore> <r> : "ᵣ" U1D63    # [ICONIC] Subscript r
<Multi_key> <underscore> <s> : "ₛ" U209B    # [ICONIC] Subscript s
<Multi_key> <underscore> <t> : "ₜ" U209C    # [ICONIC] Subscript t
<Multi_key> <underscore> <u> : "ᵤ" U1D64    # [ICONIC] Subscript u
<Multi_key> <underscore> <v> : "ᵥ" U1D65    # [ICONIC] Subscript v
<Multi_key> <underscore> <x> : "ₓ" U2093    # [ICONIC] Subscript x

########################################################################
# TYPOGRAPHY & SPACING (iconic shortcuts) — Dashes, ellipsis, special spaces, and typographic marks
########################################################################

<Multi_key> <h> <minus> : "−" U2212    # [MNEMONIC] True minus sign (math)
<Multi_key> <period> <period> <period> : "…" U2026    # [ICONIC] Ellipsis
<Multi_key> <period> <period> <bar> : "⋮" U22EE    # [ICONIC] Vertical ellipsis
<Multi_key> <space> <b> : " " U00A0    # [MNEMONIC] Non-breaking space (NBSP)
<Multi_key> <space> <t> : " " U2009    # [MNEMONIC] Thin space
<Multi_key> <space> <B> : " " U202F    # [MNEMONIC] Narrow no-break space
<Multi_key> <space> <h> : " " U200A    # [MNEMONIC] Hair space
<Multi_key> <space> <7> : " " U2007    # [MNEMONIC] Figure space (tabular)
<Multi_key> <space> <8> : " " U2008    # [MNEMONIC] Punctuation space
<Multi_key> <space> <z> : "‌" U200C    # [MNEMONIC] Zero width non-joiner (ZWNJ)
<Multi_key> <space> <Z> : "‍" U200D    # [MNEMONIC] Zero width joiner (ZWJ)
<Multi_key> <minus> <minus> <period> : "–" U2013    # [ICONIC] En dash (for ranges)
<Multi_key> <minus> <minus> <minus> : "—" U2014    # [ICONIC] Em dash (for breaks)
<Multi_key> <h> <g> <i> : "" UE0A0    # [MNEMONIC] Git branch symbol (Powerline, font-dependent)
<Multi_key> <h> <m> <e> : "↯" U21AF    # [MNEMONIC] Downwards zigzag arrow (merge conflict)
<Multi_key> <minus> <b> : "‑" U2011    # [MNEMONIC] Non-breaking hyphen

########################################################################
# SMART QUOTES (iconic shortcuts) — curly quotes
########################################################################

<Multi_key> <quotedbl> <less> : "“" U201C    # [ICONIC] Left double quotation mark
<Multi_key> <greater> <quotedbl> : "”" U201D    # [ICONIC] Right double quotation mark
<Multi_key> <apostrophe> <less> : "‘" U2018    # [ICONIC] Left single quotation mark
<Multi_key> <greater> <apostrophe> : "’" U2019    # [ICONIC] Right single quotation mark
<Multi_key> <comma> <quotedbl> : "„" U201E    # [ICONIC] Double low-9 quotation mark (German/Eastern European)
<Multi_key> <comma> <apostrophe> : "‚" U201A    # [ICONIC] Single low-9 quotation mark (German/Eastern European)
<Multi_key> <less> <less> <quotedbl> : "«" U00AB    # [ICONIC] Left-pointing double angle quotation mark
<Multi_key> <greater> <greater> <quotedbl> : "»" U00BB    # [ICONIC] Right-pointing double angle quotation mark
<Multi_key> <less> <comma> : "‹" U2039    # [ICONIC] Single left-pointing angle quotation mark
<Multi_key> <greater> <comma> : "›" U203A    # [ICONIC] Single right-pointing angle quotation mark

########################################################################
# INTERNATIONAL PUNCTUATION (iconic shortcuts) — inverted marks, special characters
########################################################################

<Multi_key> <exclam> <exclam> : "¡" U00A1    # [ICONIC] Inverted exclamation mark (Spanish)
<Multi_key> <question> <question> : "¿" U00BF    # [ICONIC] Inverted question mark (Spanish)
<Multi_key> <N> <o> : "№" U2116    # [ICONIC] Numero sign (Cyrillic/European)
<Multi_key> <question> <exclam> : "‽" U203D    # [ICONIC] Interrobang

########################################################################
# INTERNATIONAL DIACRITICS (prefix: i) — for letters not covered by dead keys
########################################################################
#
# NOTE: This section is minimal - most diacritics use dead keys.
# For MACRONS (ā ē ō): See SUPERSCRIPTS & SUBSCRIPTS section.
#   - We use __ (double underscore) for macrons instead of standard _
#   - This frees up _ (single underscore) for subscripts (more common in STEM)
#   - Example: __a → ā (macron), _a → ₐ (subscript)

<Multi_key> <i> <acute> <a> : "á" U00E1    # [MNEMONIC] a acute
<Multi_key> <i> <grave> <e> : "è" U00E8    # [MNEMONIC] e grave
<Multi_key> <i> <tilde> <n> : "ñ" U00F1    # [MNEMONIC] n tilde
<Multi_key> <i> <diaeresis> <u> : "ü" U00FC    # [MNEMONIC] u diaeresis

########################################################################
# UNITS & MEASUREMENTS (prefix: h, iconic) — Scientific notation, physical constants, and measurement units
########################################################################

# Degree and angle measurement
<Multi_key> <parenleft> <parenright> : "°" U00B0    # [ICONIC] Degree sign
<Multi_key> <o> <C> : "°C"    # [ICONIC] Degrees Celsius (composed sequence)
<Multi_key> <o> <F> : "°F"    # [ICONIC] Degrees Fahrenheit (composed sequence)
<Multi_key> <h> <d> <C> : "℃" U2103    # [MNEMONIC] Degree Celsius symbol
<Multi_key> <h> <d> <F> : "℉" U2109    # [MNEMONIC] Degree Fahrenheit symbol

# Prime notation (derivatives, coordinates, measurements)
<Multi_key> <h> <apostrophe> : "′" U2032    # [MNEMONIC] Prime (feet, derivatives, coordinates)
<Multi_key> <h> <2> <apostrophe> : "″" U2033    # [MNEMONIC] Double prime (inches, 2nd derivative)
<Multi_key> <h> <3> <apostrophe> : "‴" U2034    # [MNEMONIC] Triple prime (3rd derivative)
<Multi_key> <h> <4> <apostrophe> : "⁗" U2057    # [MNEMONIC] Quadruple prime (4th derivative)
<Multi_key> <grave> <grave> : "‵" U2035    # [ICONIC] Reversed prime (backticks = backwards)

# Physical units and constants
# <h> <m> : "µ" U00B5  # Micro sign (removed, use Greek mu instead)
<Multi_key> <h> <A> <a> : "Å" U00C5    # [MNEMONIC] Angstrom sign
<Multi_key> <h> <O> : "Ω" U03A9    # [MNEMONIC] Ohm (Greek Omega capital)
<Multi_key> <h> <percent> : "‰" U2030    # [MNEMONIC] Per mille sign
<Multi_key> <h> <b> <a> <r> : "ℏ" U210F    # [MNEMONIC] Hbar (Planck constant over 2pi)
<Multi_key> <h> <b> <r> <a> : "⟨" U27E8    # [MNEMONIC] Mathematical left angle bracket (bra)
<Multi_key> <h> <k> <e> <t> : "⟩" U27E9    # [MNEMONIC] Mathematical right angle bracket (ket)
<Multi_key> <h> <at> : "⚛" U269B    # [MNEMONIC] Atom symbol

########################################################################
# CHEMISTRY (prefix: h, iconic) — reaction arrows and symbols
########################################################################

<Multi_key> <bar> <equal> <greater> : "⇌" U21CC    # [ICONIC] Equilibrium arrow
<Multi_key> <minus> <bar> <minus> : "↽" U21BD    # [ICONIC] Leftwards harpoon with barb downwards (reversible reaction left)
<Multi_key> <bar> <minus> <greater> : "⇁" U21C1    # [ICONIC] Rightwards harpoon with barb downwards (reversible reaction right)
# mnemonic alternatives (prefix: h c)
<Multi_key> <h> <c> <e> <q> : "⇌" U21CC    # [MNEMONIC] Equilibrium arrow (mnemonic: ceq)
<Multi_key> <h> <c> <h> <l> : "↽" U21BD    # [MNEMONIC] Chemistry harpoon left (mnemonic: chl)
<Multi_key> <h> <c> <h> <r> : "⇁" U21C1    # [MNEMONIC] Chemistry harpoon right (mnemonic: chr)

########################################################################
# ASTRONOMY (prefix: h, iconic) — Celestial bodies and astronomical symbols
########################################################################

<Multi_key> <h> <asterisk> <b> : "★" U2605    # [MNEMONIC] Black star
<Multi_key> <h> <asterisk> <w> : "☆" U2606    # [MNEMONIC] White star
<Multi_key> <h> <S> <u> : "☉" U2609    # [MNEMONIC] Sun symbol
<Multi_key> <h> <T> <e> : "♁" U2641    # [MNEMONIC] Earth symbol (Terra)
<Multi_key> <h> <M> <a> : "♂" U2642    # [MNEMONIC] Mars symbol
<Multi_key> <h> <V> <e> : "♀" U2640    # [MNEMONIC] Venus symbol
<Multi_key> <h> <J> <u> : "♃" U2643    # [MNEMONIC] Jupiter symbol
<Multi_key> <h> <S> <a> : "♄" U2644    # [MNEMONIC] Saturn symbol
<Multi_key> <h> <m> <1> : "☽" U263D    # [MNEMONIC] First quarter moon
<Multi_key> <h> <m> <3> : "☾" U263E    # [MNEMONIC] Last quarter moon
<Multi_key> <h> <asciicircum> <n> : "☊" U260A    # [MNEMONIC] Ascending node (up/ascending)
<Multi_key> <h> <v> <v> <n> : "☋" U260B    # [MNEMONIC] Descending node (down/vv)

########################################################################
# IPA (prefix: p) — International Phonetic Alphabet
########################################################################

# consonants
<Multi_key> <p> <s> : "ʃ" U0283    # [MNEMONIC] IPA voiceless postalveolar fricative (esh)
<Multi_key> <p> <z> : "ʒ" U0292    # [MNEMONIC] IPA voiced postalveolar fricative (ezh)
<Multi_key> <p> <t> : "θ" U03B8    # [MNEMONIC] Greek theta used in IPA (voiceless dental fricative)
<Multi_key> <p> <d> : "ð" U00F0    # [MNEMONIC] IPA voiced dental fricative (eth)
<Multi_key> <p> <n> : "ŋ" U014B    # [MNEMONIC] IPA velar nasal (eng)
<Multi_key> <p> <r> : "ɾ" U027E    # [MNEMONIC] IPA alveolar tap
<Multi_key> <p> <l> : "ɫ" U026B    # [MNEMONIC] IPA velarized L
<Multi_key> <p> <w> : "ʍ" U028D    # [MNEMONIC] IPA voiceless labial-velar approximant
<Multi_key> <p> <v> : "ʋ" U028B    # [MNEMONIC] IPA labiodental approximant
<Multi_key> <p> <g> : "ɡ" U0261    # [MNEMONIC] IPA script g
<Multi_key> <p> <j> : "j" U006A    # [MNEMONIC] IPA palatal approximant
<Multi_key> <p> <q> : "ʔ" U0294    # [MNEMONIC] IPA glottal stop

# vowels
<Multi_key> <p> <e> <e> : "ə" U0259    # [MNEMONIC] IPA schwa (most common, double-e)
<Multi_key> <p> <E> <R> : "ɚ" U025A    # [MNEMONIC] IPA rhotic schwa (uppercase E+R for rhotic)
<Multi_key> <p> <a> : "ɐ" U0250    # [MNEMONIC] IPA near-open central vowel
<Multi_key> <p> <3> : "ɜ" U025C    # [MNEMONIC] IPA open-mid central vowel
<Multi_key> <p> <6> : "ɞ" U025E    # [MNEMONIC] IPA closed-mid central rounded vowel
<Multi_key> <p> <I> : "ɪ" U026A    # [MNEMONIC] IPA near-close front unrounded vowel
<Multi_key> <p> <U> : "ʊ" U028A    # [MNEMONIC] IPA near-close back rounded vowel
<Multi_key> <p> <o> <v> : "ʌ" U028C    # [MNEMONIC] IPA open-mid back unrounded vowel
<Multi_key> <p> <A> <A> : "ɑ" U0251    # [MNEMONIC] IPA open back unrounded vowel
<Multi_key> <p> <O> : "ɒ" U0252    # [MNEMONIC] IPA open back rounded vowel
<Multi_key> <p> <o> <e> : "ø" U00F8    # [MNEMONIC] IPA close-mid front rounded vowel
<Multi_key> <p> <o> <E> : "œ" U0153    # [MNEMONIC] IPA open-mid front rounded vowel
<Multi_key> <p> <o> <O> : "ɶ" U0276    # [MNEMONIC] IPA open front rounded vowel
<Multi_key> <p> <y> : "y" U0079    # [MNEMONIC] IPA close front rounded vowel
<Multi_key> <p> <Y> : "ʏ" U028F    # [MNEMONIC] IPA near-close front rounded vowel
<Multi_key> <p> <A> <e> : "æ" U00E6    # [MNEMONIC] IPA near-open front unrounded vowel
<Multi_key> <p> <e> <p> <s> : "ɛ" U025B    # [MNEMONIC] IPA open-mid front unrounded vowel

# length / stress / ties / diacritics
<Multi_key> <p> <colon> : "ː" U02D0    # [MNEMONIC] IPA length mark
<Multi_key> <p> <semicolon> : "ˑ" U02D1    # [MNEMONIC] IPA half-length mark
<Multi_key> <p> <apostrophe> : "ˈ" U02C8    # [MNEMONIC] IPA primary stress
<Multi_key> <p> <comma> : "ˌ" U02CC    # [MNEMONIC] IPA secondary stress
<Multi_key> <p> <c> <t> : "͡" U0361    # [MNEMONIC] Combining tie bar above
<Multi_key> <p> <c> <T> : "͜" U035C    # [MNEMONIC] Combining tie bar below
<Multi_key> <p> <c> <n> : "̃" U0303    # [MNEMONIC] Combining tilde (nasalization)

########################################################################
# CALLIGRAPHIC / FRAKTUR (prefix: k) — legacy + SMP (font dependent)
########################################################################

# legacy script/calligraphic letters
<Multi_key> <k> <H> : "ℋ" U210B    # [MNEMONIC] Script capital H
<Multi_key> <k> <I> : "ℐ" U2110    # [MNEMONIC] Script capital I
<Multi_key> <k> <L> : "ℒ" U2112    # [MNEMONIC] Script capital L
<Multi_key> <k> <R> : "ℛ" U211B    # [MNEMONIC] Script capital R
<Multi_key> <k> <F> : "ℱ" U2131    # [MNEMONIC] Script capital F
<Multi_key> <k> <B> : "ℬ" U212C    # [MNEMONIC] Script capital B

# legacy Fraktur / blackletter
<Multi_key> <k> <f> <C> : "ℭ" U212D    # [MNEMONIC] Blackletter capital C
<Multi_key> <k> <h> : "ℌ" U210C    # [MNEMONIC] Blackletter capital H
<Multi_key> <k> <f> <I> : "ℑ" U2111    # [MNEMONIC] Blackletter capital I (Imaginary part)
<Multi_key> <k> <f> <R> : "ℜ" U211C    # [MNEMONIC] Blackletter capital R (Real part)
<Multi_key> <k> <Z> : "ℨ" U2128    # [MNEMONIC] Blackletter capital Z
<Multi_key> <k> <N> : "ℵ" U2135    # [MNEMONIC] Aleph symbol

# optional SMP script capitals (font dependent)
<Multi_key> <k> <S> : "𝒮" U1D4AE    # [MNEMONIC] Mathematical script capital S
<Multi_key> <k> <M> : "𝓜" U1D4DC    # [MNEMONIC] Mathematical script capital M
<Multi_key> <k> <m> <C> : "𝒞" U1D49E    # [MNEMONIC] Mathematical script capital C

########################################################################
# UI SYMBOLS & SHAPES (prefix: k) — Interface symbols, keyboard glyphs, and geometric shapes
########################################################################

<Multi_key> <k> <c> : "⌘" U2318    # [MNEMONIC] Place of Interest sign (Command key)
<Multi_key> <k> <o> : "⌥" U2325    # [MNEMONIC] Option key symbol
<Multi_key> <k> <r> : "⌃" U2303    # [MNEMONIC] Up arrowhead (Control key symbol)
<Multi_key> <k> <s> : "⇧" U21E7    # [MNEMONIC] Upwards white arrow (Shift)
<Multi_key> <k> <e> : "⏎" U23CE    # [MNEMONIC] Return symbol (Enter)
<Multi_key> <k> <b> : "⌫" U232B    # [MNEMONIC] Erase to the left (Backspace)
<Multi_key> <k> <d> : "⌦" U2326    # [MNEMONIC] Erase to the right (Delete)
<Multi_key> <k> <x> : "⎋" U238B    # [MNEMONIC] Broken circle with northwest arrow (Escape)
<Multi_key> <k> <C> : "⎈" U2388    # [MNEMONIC] Helm symbol often used for Control

# UI shapes for documentation
<Multi_key> <k> <O> <w> : "○" U25CB    # [MNEMONIC] White circle (O=circle)
<Multi_key> <k> <O> <b> : "●" U25CF    # [MNEMONIC] Black circle (O=circle)
<Multi_key> <k> <O> <d> : "◉" U25C9    # [MNEMONIC] Fisheye dotted circle (O=circle)
<Multi_key> <k> <O> <e> : "◌" U25CC    # [MNEMONIC] Dotted circle diacritic placeholder (O=circle)
<Multi_key> <k> <w> <s> : "□" U25A1    # [MNEMONIC] White square
<Multi_key> <k> <w> <S> : "◻" U25FB    # [MNEMONIC] White medium square
<Multi_key> <k> <f> <s> : "■" U25A0    # [MNEMONIC] Black filled square
<Multi_key> <k> <f> <S> : "◼" U25FC    # [MNEMONIC] Black filled medium square
<Multi_key> <k> <t> <r> <u> : "▲" U25B2    # [MNEMONIC] Black up-pointing triangle
<Multi_key> <k> <t> <r> <d> : "▼" U25BC    # [MNEMONIC] Black down-pointing triangle
<Multi_key> <k> <t> <r> <l> : "◀" U25C0    # [MNEMONIC] Black left-pointing triangle
<Multi_key> <k> <t> <r> <r> : "▶" U25B6    # [MNEMONIC] Black right-pointing triangle
<Multi_key> <k> <l> <o> : "◊" U25CA    # [MNEMONIC] Lozenge (diamond shape)

# Checkboxes for task lists
<Multi_key> <k> <bracketleft> <bracketright> : "☐" U2610    # [MNEMONIC] Ballot box (empty checkbox)
<Multi_key> <k> <bracketleft> <v> : "☑" U2611    # [MNEMONIC] Ballot box with check (checked)
<Multi_key> <k> <bracketleft> <x> : "☒" U2612    # [MNEMONIC] Ballot box with X (crossed)

# Additional bullets
<Multi_key> <k> <w> <b> : "◦" U25E6    # [MNEMONIC] White bullet

########################################################################
# BOX-DRAWING (prefix: b) — minimal starter
########################################################################

<Multi_key> <b> <minus> : "─" U2500    # [MNEMONIC] Box drawings light horizontal
<Multi_key> <b> <bar> : "│" U2502    # [MNEMONIC] Box drawings light vertical
<Multi_key> <b> <l> <u> : "┌" U250C    # [MNEMONIC] Box drawings light down and right
<Multi_key> <b> <r> <u> : "┐" U2510    # [MNEMONIC] Box drawings light down and left
<Multi_key> <b> <l> <d> : "└" U2514    # [MNEMONIC] Box drawings light up and right
<Multi_key> <b> <r> <d> : "┘" U2518    # [MNEMONIC] Box drawings light up and left
<Multi_key> <b> <t> : "┬" U252C    # [MNEMONIC] Box drawings light down and horizontal
<Multi_key> <b> <T> : "┴" U2534    # [MNEMONIC] Box drawings light up and horizontal
<Multi_key> <b> <L> : "├" U251C    # [MNEMONIC] Box drawings light vertical and right
<Multi_key> <b> <R> : "┤" U2524    # [MNEMONIC] Box drawings light vertical and left
<Multi_key> <b> <plus> : "┼" U253C    # [MNEMONIC] Box drawings light vertical and horizontal
# double lines for ricing
<Multi_key> <b> <D> <minus> : "═" U2550    # [MNEMONIC] Box drawings double horizontal
<Multi_key> <b> <D> <bar> : "║" U2551    # [MNEMONIC] Box drawings double vertical
<Multi_key> <b> <D> <plus> : "╬" U256C    # [MNEMONIC] Box drawings double vertical and horizontal
<Multi_key> <b> <D> <l> <u> : "╔" U2554    # [MNEMONIC] Box drawings double down and right
<Multi_key> <b> <D> <r> <u> : "╗" U2557    # [MNEMONIC] Box drawings double down and left
<Multi_key> <b> <D> <l> <d> : "╚" U255A    # [MNEMONIC] Box drawings double up and right
<Multi_key> <b> <D> <r> <d> : "╝" U255D    # [MNEMONIC] Box drawings double up and left
# curves (double)
<Multi_key> <b> <D> <c> <l> <u> : "╭" U256D    # [MNEMONIC] Box drawings light arc down and right (rounded upper left)
<Multi_key> <b> <D> <c> <r> <u> : "╮" U256E    # [MNEMONIC] Box drawings light arc down and left (rounded upper right)
<Multi_key> <b> <D> <c> <l> <d> : "╰" U2570    # [MNEMONIC] Box drawings light arc up and right (rounded lower left)
<Multi_key> <b> <D> <c> <r> <d> : "╯" U256F    # [MNEMONIC] Box drawings light arc up and left (rounded lower right)
<Multi_key> <b> <slash> : "╱" U2571    # [MNEMONIC] Light diagonal upper right to lower left
<Multi_key> <b> <backslash> : "╲" U2572    # [MNEMONIC] Light diagonal upper left to lower right
<Multi_key> <b> <s> <l> : "░" U2591    # [MNEMONIC] Light shade
<Multi_key> <b> <s> <m> : "▒" U2592    # [MNEMONIC] Medium shade
<Multi_key> <b> <s> <d> : "▓" U2593    # [MNEMONIC] Dark shade
<Multi_key> <b> <D> <t> : "╦" U2566    # [MNEMONIC] Double down and horizontal

########################################################################
# MUSIC SYMBOLS (prefix: u) — notes, flats, sharps
########################################################################

<Multi_key> <u> <n> <8> : "♪" U266A    # [MNEMONIC] Eighth note
<Multi_key> <u> <n> <b> : "♫" U266B    # [MNEMONIC] Beamed eighth notes
<Multi_key> <u> <f> : "♭" U266D    # [MNEMONIC] Flat
<Multi_key> <u> <n> <a> <t> : "♮" U266E    # [MNEMONIC] Natural
<Multi_key> <u> <s> : "♯" U266F    # [MNEMONIC] Sharp
<Multi_key> <u> <r> <q> : "𝄻" U1D13B    # [MNEMONIC] Quarter rest (font-dependent)
<Multi_key> <u> <r> <h> : "𝄼" U1D13C    # [MNEMONIC] Half rest (font-dependent)
<Multi_key> <u> <r> <w> : "𝄺" U1D13A    # [MNEMONIC] Whole rest (font-dependent)

########################################################################
# CURRENCY (prefix: c) — symbols for common currencies
########################################################################
# Both ASCII shortcuts (fast) and <c> prefix mnemonics (discoverable)

# ASCII shortcuts
<Multi_key> <E> <equal> : "€" U20AC    # [ICONIC] Euro sign
<Multi_key> <L> <minus> : "£" U00A3    # [ICONIC] Pound sign
<Multi_key> <Y> <minus> : "¥" U00A5    # [ICONIC] Yen sign
<Multi_key> <R> <bar> : "₹" U20B9    # [ICONIC] Indian rupee sign
<Multi_key> <B> <b> : "₿" U20BF    # [ICONIC] Bitcoin sign
<Multi_key> <R> <u> : "₽" U20BD    # [ICONIC] Ruble sign
<Multi_key> <W> <equal> : "₩" U20A9    # [ICONIC] Won sign (KRW)
<Multi_key> <D> <equal> : "₫" U20AB    # [ICONIC] Dong sign (VND)
<Multi_key> <N> <equal> : "₪" U20AA    # [ICONIC] New shekel sign (ILS)
<Multi_key> <T> <L> : "₺" U20BA    # [ICONIC] Turkish lira sign (TRY)
<Multi_key> <F> <r> : "₣" U20A3    # [ICONIC] French franc sign (legacy)
<Multi_key> <X> <X> : "¤" U00A4    # [ICONIC] Generic currency sign

# Currency prefix alternatives (prefix: c)
<Multi_key> <c> <e> : "€" U20AC    # [MNEMONIC] Euro (mnemonic: ce)
<Multi_key> <c> <p> : "£" U00A3    # [MNEMONIC] Pound (mnemonic: cp)
<Multi_key> <c> <y> : "¥" U00A5    # [MNEMONIC] Yen (mnemonic: cy)
<Multi_key> <c> <r> : "₹" U20B9    # [MNEMONIC] Rupee (mnemonic: cr)
<Multi_key> <c> <b> : "₿" U20BF    # [MNEMONIC] Bitcoin (mnemonic: cb)
<Multi_key> <c> <R> : "₽" U20BD    # [MNEMONIC] Ruble (mnemonic: cR)
<Multi_key> <c> <w> : "₩" U20A9    # [MNEMONIC] Won (mnemonic: cw)
<Multi_key> <c> <d> : "₫" U20AB    # [MNEMONIC] Dong (mnemonic: cd)
<Multi_key> <c> <s> : "₪" U20AA    # [MNEMONIC] Shekel (mnemonic: cs)
<Multi_key> <c> <t> : "₺" U20BA    # [MNEMONIC] Turkish lira (mnemonic: ct)
<Multi_key> <c> <f> : "₣" U20A3    # [MNEMONIC] French franc (mnemonic: cf)
<Multi_key> <c> <x> : "¤" U00A4    # [MNEMONIC] Generic currency (mnemonic: cx)

########################################################################
# LEGAL / DOCUMENT SYMBOLS (iconic shortcuts) — copyright/trademark/section/paragraph
########################################################################

<Multi_key> <C> <C> : "©" U00A9    # [MNEMONIC] Copyright sign
<Multi_key> <R> <R> : "®" U00AE    # [MNEMONIC] Registered trademark sign
<Multi_key> <T> <M> : "™" U2122    # [MNEMONIC] Trademark sign (TM abbreviation)
<Multi_key> <S> <S> : "§" U00A7    # [MNEMONIC] Section sign
<Multi_key> <P> <P> : "¶" U00B6    # [MNEMONIC] Pilcrow sign (paragraph mark)
<Multi_key> <D> <D> : "†" U2020    # [MNEMONIC] Dagger (footnote)
<Multi_key> <F> <F> : "‡" U2021    # [MNEMONIC] Double dagger (footnote)

########################################################################