My Compose key configuration

.XCompose

include "/usr/share/X11/locale/en_US.UTF-8/Compose"

# See
# http://s.arboreus.com/2008/02/compose.html
# http://shoorick.livejournal.com/tag/compose

# Punctuation
# знаки препинания, необходимые в русском, которых нет в en_US.UTF-8/Compose
<Multi_key> <period> <minus> : "…" U2026 # HORIZONTAL ELLIPSIS, многоточие
<Multi_key> <period> <space> : "…" U2026 # HORIZONTAL ELLIPSIS, многоточие
<Multi_key> <?> <!> : "⁈" U2048 # QUESTION EXCLAMATION, ?!
<Multi_key> <period> <colon> : "…" # ELLIPSIS

# №: набирается в русской раскладке без ухищрений,
# « » кавычки: Compose + < + <  и Compose + > + > соответственно
# ­— тире: Compose + 3 раза дефис

# COMBINING SIGNS, модифицирующие знаки (меняют предыдущий символ)
<Multi_key> <apostrophe> <apostrophe> : "́" U0301 # ударение
<Multi_key> <v> <v> : "⃗" U20D7 # знак вектора
<Multi_key> <z> <z> : "̶"  U0336 # зачёркивание
<Multi_key> <v> <i> : "̅" U0305 # COMBINING OVERLINE, vinculum, надчёркивание

# Удобная пунктуация в русской раскладке
<Multi_key> <Cyrillic_be> <Cyrillic_be>	: "„" # открывающая кавычка-лапка (RUS)
<Multi_key> <Cyrillic_yu> <Cyrillic_yu>	: "“" # закрывающая кавычка-лапка (RUS)
<Multi_key> <Cyrillic_io> <Cyrillic_io>	: "“" # закрывающая кавычка-лапка (RUS)
<Multi_key> <slash> <slash> : "«" # открывающая кавычка-ёлочка (RUS)
<Multi_key> <bar> <bar> : "»" # закрывающая кавычка-ёлочка (RUS)
<Multi_key> <Cyrillic_BE> <Cyrillic_BE>: "«" # открывающая кавычка-ёлочка (RUS)
<Multi_key> <Cyrillic_YU> <Cyrillic_YU>: "»" # закрывающая кавычка-ёлочка (RUS)
<Multi_key> <Cyrillic_ya> : "̶"  # зачеркивание (комбинирующееся)
<Multi_key> <Cyrillic_e> <Cyrillic_e> : "́" # ударение (комбинирующееся)

# Old (pre-1917) russian:
<Multi_key> <minus> <Cyrillic_SOFTSIGN>         : "Ѣ"   U0462 # CYRILLIC CAPITAL LETTER YAT
<Multi_key> <minus> <Cyrillic_softsign>         : "ѣ"   U0463 # CYRILLIC SMALL LETTER YAT
<Multi_key> <minus> <Cyrillic_O>                : "Ѳ"   U0472 # CYRILLIC CAPITAL LETTER FITA
<Multi_key> <minus> <Cyrillic_o>                : "ѳ"   U0473 # CYRILLIC SMALL LETTER FITA
<Multi_key> <Cyrillic_SOFTSIGN> <minus>         : "Ѣ"   U0462 # CYRILLIC CAPITAL LETTER YAT
<Multi_key> <Cyrillic_softsign> <minus>         : "ѣ"   U0463 # CYRILLIC SMALL LETTER YAT
<Multi_key> <Cyrillic_O> <minus>                : "Ѳ"   U0472 # CYRILLIC CAPITAL LETTER FITA
<Multi_key> <Cyrillic_o> <minus>                : "ѳ"   U0473 # CYRILLIC SMALL LETTER FITA
<Multi_key> <Cyrillic_EF> <Cyrillic_EF>         : "Ѳ"   U0472 # CYRILLIC CAPITAL LETTER FITA
<Multi_key> <Cyrillic_ef> <Cyrillic_ef>         : "ѳ"   U0473 # CYRILLIC SMALL LETTER FITA
<Multi_key> <Cyrillic_I>  <Cyrillic_I>          : "І"   U0406 # CYRILLIC CAPITAL LETTER I decimal
<Multi_key> <Cyrillic_i>  <Cyrillic_i>          : "і"   U0456 # CYRILLIC SMALL LETTER I decimal
<Multi_key> <Cyrillic_I>  <Cyrillic_EM>         : "Ѵ"   U0474 # CYRILLIC CAPITAL LETTER IZHITSA
<Multi_key> <Cyrillic_i>  <Cyrillic_em>         : "ѵ"   U0475 # CYRILLIC SMALL LETTER IZHITSA

# Ukrainian and Byelorussian
<Multi_key> <Cyrillic_ES> <minus>               : "Є"   U04D8 # CYRILLIC CAPITAL LETTER IE
<Multi_key> <Cyrillic_es> <minus>               : "є"   U04D8 # CYRILLIC SMALL LETTER IE
<Multi_key> <Cyrillic_U> <Cyrillic_U>           : "Ў"   U04D8 # CYRILLIC CAPITAL U WITH BREVE
<Multi_key> <Cyrillic_u> <Cyrillic_u>           : "ў"   U04D8 # CYRILLIC SMALL LETTER U WITH BREVE
<Multi_key> <Cyrillic_U> <Cyrillic_SHORTI>      : "Ў"   U04D8 # CYRILLIC CAPITAL U WITH BREVE
<Multi_key> <Cyrillic_u> <Cyrillic_shorti>      : "ў"   U04D8 # CYRILLIC SMALL LETTER U WITH BREVE
<Multi_key> <Cyrillic_U> <parenleft>            : "Ў"   U04D8 # CYRILLIC CAPITAL U WITH BREVE
<Multi_key> <Cyrillic_u> <parenleft>            : "ў"   U04D8 # CYRILLIC SMALL LETTER U WITH BREVE
<Multi_key> <Cyrillic_E>  <Cyrillic_SHA>        : "Ї"   U0407 # CYRILLIC CAPITAL LETTER YI
<Multi_key> <Cyrillic_E>  <Cyrillic_sha>        : "ї"   U0457 # CYRILLIC SMALL LETTER YI
<Multi_key> <Cyrillic_E>  <Cyrillic_I>          : "Ї"   U0407 # CYRILLIC CAPITAL LETTER YI
<Multi_key> <Cyrillic_E>  <Cyrillic_i>          : "ї"   U0457 # CYRILLIC SMALL LETTER YI

# Serbian
<Multi_key> <Cyrillic_EL> <Cyrillic_SOFTSIGN>   : "Љ"   U0409 # CYRILLIC CAPITAL LETTER LJE
<Multi_key> <Cyrillic_EL> <Cyrillic_softsign>   : "Љ"   U0409 # CYRILLIC CAPITAL LETTER LJE
<Multi_key> <Cyrillic_EN> <Cyrillic_SOFTSIGN>   : "Њ"   U040A # CYRILLIC CAPITAL LETTER NJE
<Multi_key> <Cyrillic_EN> <Cyrillic_softsign>   : "Њ"   U040A # CYRILLIC CAPITAL LETTER NJE
<Multi_key> <Cyrillic_el> <Cyrillic_softsign>   : "љ"   U0459 # CYRILLIC SMALL LETTER LJE
<Multi_key> <Cyrillic_en> <Cyrillic_softsign>   : "њ"   U045A # CYRILLIC SMALL LETTER NJE
<Multi_key> <Cyrillic_TE> <Cyrillic_CHE>        : "Ћ"   U040B # CYRILLIC CAPITAL LETTER TSHE
<Multi_key> <Cyrillic_te> <Cyrillic_che>        : "ћ"   U045B # CYRILLIC SMALL LETTER TSHE
<Multi_key> <Cyrillic_DE> <Cyrillic_CHE>        : "Ђ"   U0402 # CYRILLIC CAPITAL LETTER TSHE
<Multi_key> <Cyrillic_de> <Cyrillic_che>        : "ђ"   U0452 # CYRILLIC SMALL LETTER TSHE
<Multi_key> <Cyrillic_SHORTI> <Cyrillic_SHORTI> : "Ј"   U0408 # CYRILLIC CAPITAL LETTER DJE
<Multi_key> <Cyrillic_shorti> <Cyrillic_shorti> : "ј"   U0458 # CYRILLIC SMALL LETTER DJE
<Multi_key> <Cyrillic_TSE> <Cyrillic_TSE>       : "Џ"   U040F # CYRILLIC CAPITAL LETTER DZHE
<Multi_key> <Cyrillic_tse> <Cyrillic_tse>       : "џ"   U045F # CYRILLIC SMALL LETTER DZHE

# Bashkir, Tatar, Kazakh
<Multi_key> <Cyrillic_IE> <Cyrillic_IE>         : "Ә"   U04D8 # CYRILLIC CAPITAL LETTER SCHWA
<Multi_key> <Cyrillic_ie> <Cyrillic_ie>         : "ә"   U04D9 # CYRILLIC SMALL LETTER SCHWA
<Multi_key> <Cyrillic_CHE> <Cyrillic_CHE>       : "Һ"   U04BA # CYRILLIC CAPITAL LETTER SHHA
<Multi_key> <Cyrillic_che> <Cyrillic_che>       : "һ"   U04BB # CYRILLIC SMALL LETTER SHHA
# Usual order: diacritics then letter
<Multi_key> <minus> <Z>                         : "Ƶ"   U01B5 # LATIN CAPITAL LETTER Z WITH STROKE
<Multi_key> <minus> <z>                         : "ƶ"   U01B6 # LATIN SMALL LETTER Z WITH STROKE
<Multi_key> <minus> <O>                         : "Ɵ"   U019F # LATIN CAPITAL LETTER BARRED O
<Multi_key> <minus> <o>                         : "ɵ"   U0275 # LATIN SMALL LETTER BARRED O
<Multi_key> <minus>             <Cyrillic_GHE>  : "Ғ"   U0462 # CYRILLIC CAPITAL LETTER GHE WITH STROKE
<Multi_key> <minus>             <Cyrillic_ghe>  : "ғ"   U0463 # CYRILLIC SMALL LETTER GHE WITH STROKE
<Multi_key> <comma>             <Cyrillic_ZHE>  : "Җ"   U0496 # CYRILLIC CAPITAL LETTER ZHE WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_zhe>  : "җ"   U0497 # CYRILLIC SMALL LETTER ZHE WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_ZE>   : "Ҙ"   U0498 # CYRILLIC CAPITAL LETTER ZE WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_ze>   : "ҙ"   U0499 # CYRILLIC SMALL LETTER ZE WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_KA>   : "Қ"   U049A # CYRILLIC CAPITAL LETTER KA WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_ka>   : "қ"   U049B # CYRILLIC SMALL LETTER KA WITH DESCENDER
<Multi_key> <Cyrillic_HARDSIGN> <Cyrillic_KA>   : "Ҡ"   U04A0 # CYRILLIC CAPITAL LETTER BASHKIR KA
<Multi_key> <Cyrillic_hardsign> <Cyrillic_KA>   : "Ҡ"   U04A0 # CYRILLIC CAPITAL LETTER BASHKIR KA
<Multi_key> <Cyrillic_hardsign> <Cyrillic_ka>   : "ҡ"   U04A1 # CYRILLIC SMALL LETTER BASHKIR KA
<Multi_key> <comma>             <Cyrillic_EN>   : "Ң"   U04A2 # CYRILLIC CAPITAL LETTER EN WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_en>   : "ң"   U04A3 # CYRILLIC SMALL LETTER EN WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_ES>   : "Ҫ"   U04AA # CYRILLIC CAPITAL LETTER ES WITH DESCENDER
<Multi_key> <comma>             <Cyrillic_es>   : "ҫ"   U04AB # CYRILLIC SMALL LETTER ES WITH DESCENDER
<Multi_key> <backslash>         <Cyrillic_U>    : "Ү"   U04AE # CYRILLIC CAPITAL LETTER STRAIGHT U
<Multi_key> <slash>             <Cyrillic_U>    : "Ү"   U04AE # CYRILLIC CAPITAL LETTER STRAIGHT U
<Multi_key> <backslash>         <Cyrillic_u>    : "ү"   U04AF # CYRILLIC SMALL LETTER STRAIGHT U
<Multi_key> <minus>             <Cyrillic_U>    : "Ұ"   U04B0 # CYRILLIC CAPITAL LETTER STRAIGT U WITH STROKE
<Multi_key> <minus>             <Cyrillic_u>    : "ұ"   U04B1 # CYRILLIC SMALL LETTER STRAIGT U WITH STROKE
<Multi_key> <underscore>        <Cyrillic_O>    : "Ө"   U04E8 # CYRILLIC CAPITAL LETTER BARRED O
<Multi_key> <underscore>        <Cyrillic_o>    : "ө"   U04E9 # CYRILLIC SMALL LETTER BARRED O
# Reverse order: letter then diacritics
<Multi_key> <Z> <minus>                         : "Ƶ"   U01B5 # LATIN CAPITAL LETTER Z WITH STROKE
<Multi_key> <z> <minus>                         : "ƶ"   U01B6 # LATIN SMALL LETTER Z WITH STROKE
<Multi_key> <O> <minus>                         : "Ɵ"   U019F # LATIN CAPITAL LETTER BARRED O
<Multi_key> <o> <minus>                         : "ɵ"   U0275 # LATIN SMALL LETTER BARRED O
<Multi_key> <Cyrillic_GHE> <minus>              : "Ғ"   U0462 # CYRILLIC CAPITAL LETTER GHE WITH STROKE
<Multi_key> <Cyrillic_ghe> <minus>              : "ғ"   U0463 # CYRILLIC SMALL LETTER GHE WITH STROKE
<Multi_key> <Cyrillic_ZHE> <comma>              : "Җ"   U0496 # CYRILLIC CAPITAL LETTER ZHE WITH DESCENDER
<Multi_key> <Cyrillic_zhe> <comma>              : "җ"   U0497 # CYRILLIC SMALL LETTER ZHE WITH DESCENDER
<Multi_key> <Cyrillic_ZE>  <comma>              : "Ҙ"   U0498 # CYRILLIC CAPITAL LETTER ZE WITH DESCENDER
<Multi_key> <Cyrillic_ze>  <comma>              : "ҙ"   U0499 # CYRILLIC SMALL LETTER ZE WITH DESCENDER
<Multi_key> <Cyrillic_KA>  <comma>              : "Қ"   U049A # CYRILLIC CAPITAL LETTER KA WITH DESCENDER
<Multi_key> <Cyrillic_ka>  <comma>              : "қ"   U049B # CYRILLIC SMALL LETTER KA WITH DESCENDER
<Multi_key> <Cyrillic_KA>  <Cyrillic_HARDSIGN>  : "Ҡ"   U04A0 # CYRILLIC CAPITAL LETTER BASHKIR KA
<Multi_key> <Cyrillic_KA>  <Cyrillic_hardsign>  : "Ҡ"   U04A0 # CYRILLIC CAPITAL LETTER BASHKIR KA
<Multi_key> <Cyrillic_ka>  <Cyrillic_hardsign>  : "ҡ"   U04A1 # CYRILLIC SMALL LETTER BASHKIR KA
<Multi_key> <Cyrillic_EN>  <comma>              : "Ң"   U04A2 # CYRILLIC CAPITAL LETTER EN WITH DESCENDER
<Multi_key> <Cyrillic_en>  <comma>              : "ң"   U04A3 # CYRILLIC SMALL LETTER EN WITH DESCENDER
<Multi_key> <Cyrillic_ES>  <comma>              : "Ҫ"   U04AA # CYRILLIC CAPITAL LETTER ES WITH DESCENDER
<Multi_key> <Cyrillic_es>  <comma>              : "ҫ"   U04AB # CYRILLIC SMALL LETTER ES WITH DESCENDER
<Multi_key> <Cyrillic_U>   <backslash>          : "Ү"   U04AE # CYRILLIC CAPITAL LETTER STRAIGHT U
<Multi_key> <Cyrillic_U>   <slash>              : "Ү"   U04AE # CYRILLIC CAPITAL LETTER STRAIGHT U
<Multi_key> <Cyrillic_u>   <backslash>          : "ү"   U04AF # CYRILLIC SMALL LETTER STRAIGHT U
<Multi_key> <Cyrillic_u>   <slash>              : "ү"   U04AF # CYRILLIC SMALL LETTER STRAIGHT U
<Multi_key> <Cyrillic_U>   <minus>              : "Ұ"   U04B0 # CYRILLIC CAPITAL LETTER STRAIGHT U WITH STROKE
<Multi_key> <Cyrillic_u>   <minus>              : "ұ"   U04B1 # CYRILLIC SMALL LETTER STRAIGHT U WITH STROKE
<Multi_key> <Cyrillic_O>   <underscore>         : "Ө"   U04E8 # CYRILLIC CAPITAL LETTER BARRED O
<Multi_key> <Cyrillic_o>   <underscore>         : "ө"   U04E9 # CYRILLIC SMALL LETTER BARRED O

# Ruble
<Multi_key> <minus> <Cyrillic_ER>               : "₽"   U20BD # RUBLE SIGN
<Multi_key> <minus> <Cyrillic_er>               : "₽"   U20BD # RUBLE SIGN
<Multi_key> <minus> <P>                         : "₽"   U20BD # RUBLE SIGN
<Multi_key> <minus> <p>                         : "₽"   U20BD # RUBLE SIGN

# MATH, немного математики…
<Multi_key> <O> <slash> : "⌀" U2300 # DIAMETER SIGN
<Multi_key> <slash> <O> : "⌀" U2300 # DIAMETER SIGN
<Multi_key> <r> <r> : "√" U221A # SQUARE ROOT
<Multi_key> <r> <3> : "∛" U221B # CUBE ROOT
<Multi_key> <m> <A> : "∀" U2200 # FOR ALL
<Multi_key> <m> <E> : "∃" U2203 # THERE EXISTS
<Multi_key> <m> <i> : "∊" U220A # SMALL ELEMENT OF
<Multi_key> <m> <d> : "∂" U2202 # PARTIAL DIFFERENTIAL
<Multi_key> <m> <D> : "∆" U2206 # INCREMENT, Laplace operator
<Multi_key> <m> <S> : "∑" U2211 # N-ARY SUMMATION, Sigma
<Multi_key> <m> <I> : "∫" U222B # INTEGRAL
<Multi_key> <m> <minus> : "−" U2212 # MINUS SIGN
<Multi_key> <equal> <asciitilde> : "≈" U2248 # ALMOST EQUAL TO
<Multi_key> <asciitilde> <equal> : "≈" U2248 # ALMOST EQUAL TO
<Multi_key> <underscore> <underscore> : "‾" U023E # OVERLINE
<Multi_key> <equal> <slash>  	: "≠"   U2260 # NOT EQUAL TO
<Multi_key> <slash> <equal>  	: "≠"   U2260 # NOT EQUAL TO
<Multi_key> <minus> <equal> 	: "≡"   U2261 # IDENTICAL TO
<Multi_key> <equal> <minus> 	: "≡"   U2261 # IDENTICAL TO
<Multi_key> <m> <less> <equal> : "≤" U2264 # LESS-THAN OR EQUAL TO
<Multi_key> <m> <greater> <equal> : "≥" U2265 # GREATER-THAN OR EQUAL TO
<Multi_key> <m> <o> <o> : "∞" # infty
<Multi_key> <m> <_> <i> : "ᵢ" # subscript i
<Multi_key> <m> <^> <i> : "ⁱ" # superscript i
<Multi_key> <m> <_> <minus> : "₋" # subscript minus
<Multi_key> <m> <^> <minus> : "⁻" # superscript minus
<Multi_key> <m> <_> <plus> : "₊" # subscript plus
<Multi_key> <m> <^> <plus> : "⁺" # superscript plus
<Multi_key> <m> <asterisk> : "∘" # ring (function compose) operator
<Multi_key> <m> <period> : "∙" # dot operator
<Multi_key> <m> <asciitilde> : "∝" # proportional to
<Multi_key> <q> <e> <d> : "∎" # q.e.d.
# Math
<Multi_key> <equal> <slash>     : "≠"   U2260 # NOT EQUAL TO
<Multi_key> <slash> <equal>     : "≠"   U2260 # NOT EQUAL TO
<Multi_key> <minus> <equal>     : "≡"   U2261 # IDENTICAL TO
<Multi_key> <equal> <minus>     : "≡"   U2261 # IDENTICAL TO
<Multi_key> <m> <minus> : "−" U2212 # MINUS

# Superscript and subscripts
<Multi_key> <asciicircum> <minus> 	: "⁻"   U207B # SUPERSCRIPT MINUS
<Multi_key> <underscore> <minus> 	: "₋"   U208B # SUBSCRIPT MINUS
# Ordinal indicators
<Multi_key> <A> <A> : "ª"
<Multi_key> <O> <O> : "º"

# GREEK LETTERS, греческие буквы
<Multi_key> <ampersand> <a> : "α"
<Multi_key> <ampersand> <A> : "Α"
<Multi_key> <ampersand> <b> : "β"
<Multi_key> <ampersand> <B> : "Β"
<Multi_key> <ampersand> <c> : "χ"
<Multi_key> <ampersand> <C> : "Χ"
<Multi_key> <ampersand> <d> : "δ"
<Multi_key> <ampersand> <D> : "Δ"
<Multi_key> <ampersand> <e> : "ε"
<Multi_key> <ampersand> <E> : "Ε"
<Multi_key> <ampersand> <f> : "φ"
<Multi_key> <ampersand> <F> : "Φ"
<Multi_key> <ampersand> <g> : "γ"
<Multi_key> <ampersand> <G> : "Γ"
<Multi_key> <ampersand> <h> : "η"
<Multi_key> <ampersand> <H> : "Η"
<Multi_key> <ampersand> <i> : "ι"
<Multi_key> <ampersand> <I> : "Ι"
<Multi_key> <ampersand> <j> : "ϕ"
<Multi_key> <ampersand> <J> : "ϑ"
<Multi_key> <ampersand> <k> : "κ"
<Multi_key> <ampersand> <K> : "Κ"
<Multi_key> <ampersand> <l> : "λ"
<Multi_key> <ampersand> <L> : "Λ"
<Multi_key> <ampersand> <m> : "μ"
<Multi_key> <ampersand> <M> : "Μ"
<Multi_key> <ampersand> <n> : "ν"
<Multi_key> <ampersand> <N> : "Ν"
<Multi_key> <ampersand> <o> : "ο"
<Multi_key> <ampersand> <O> : "Ο"
<Multi_key> <ampersand> <p> : "π"
<Multi_key> <ampersand> <P> : "Π"
<Multi_key> <ampersand> <q> : "θ"
<Multi_key> <ampersand> <Q> : "Θ"
<Multi_key> <ampersand> <r> : "ρ"
<Multi_key> <ampersand> <R> : "Ρ"
<Multi_key> <ampersand> <s> : "σ"
<Multi_key> <ampersand> <S> : "Σ"
<Multi_key> <ampersand> <t> : "τ"
<Multi_key> <ampersand> <T> : "Τ"
<Multi_key> <ampersand> <u> : "υ"
<Multi_key> <ampersand> <U> : "Υ"
<Multi_key> <ampersand> <v> : "ϖ"
<Multi_key> <ampersand> <V> : "ς"
<Multi_key> <ampersand> <w> : "ω"
<Multi_key> <ampersand> <W> : "Ω"
<Multi_key> <ampersand> <x> : "ξ"
<Multi_key> <ampersand> <X> : "Ξ"
<Multi_key> <ampersand> <y> : "ψ"
<Multi_key> <ampersand> <Y> : "Ψ"
<Multi_key> <ampersand> <z> : "ζ"
<Multi_key> <ampersand> <Z> : "Ζ"

# макросы для писем и веба
<Multi_key> <S> <Y> : "Sincerely yours"
<Multi_key> <B> <R> : "Best regards"
<Multi_key> <a> <h> : "<a href=\"\"></a>"
<Multi_key> <i> <m> : "<img src=\"\" alt=\"\">"
<Multi_key> <b> <q> : "<blockquote></blockquote>"
<Multi_key> <c> <d> : "<code></code>"
<Multi_key> <e> <m> : "<em></em>"
<Multi_key> <s> <t> : "<strong></strong>"
<Multi_key> <p> <r> : "<pre class=\"sh_code\"></pre>"
<Multi_key> <m> <m> : ":m + "

# JUST FOR FUN, веселья ради
<Multi_key> <bracketleft> <space> <bracketright> : "☐" # квадратик
<Multi_key> <bracketleft> <v> <bracketright> : "☑" # квадратик
<Multi_key> <bracketleft> <x> <bracketright> : "☒" # квадратик
<Multi_key> <asterisk> <asterisk> : "★" U2605 # закрашенная звёзда
<Multi_key> <asterisk> <0> : "☆" U2606 # незакрашенная звёзда
<Multi_key> <t> <t> : "☎" U260E # телефон
<Multi_key> <k> <b> : "⌨" U2328 # клавиатурка
<Multi_key> <c> <l> : "⌚" U231A # часы
<Multi_key> <n> <n> : "♫" U266B # нотки
<Multi_key> <n> <b> : "♭" U266D # бемоль
<Multi_key> <n> <number> : "♯" U266F # диез
<Multi_key> <less> <3> : "♥" U2665 # сердечко
<Multi_key> <less> <0> : "♡" U2661 # пустое сердечко
<Multi_key> <3> <3> : "☘" U2618 # трилистник
<Multi_key> <asciitilde> <asciitilde> : "☙" U2619 # завитушка
<Multi_key> <p> <e> : "☮"> U262E # пацифизм
<Multi_key> <k> <z> : "☭" U262D # «коси и забивай»
<Multi_key> <w> <w> : "⚠" U26A0 # внимание
<Multi_key> <b> <h> : "☣" U2623 # биохазард!
<Multi_key> <r> <a> : "☢" U2622 # радиоактивность!!
<Multi_key> <percent> <percent> : "⌘" U2318 # осторожно, маки!!!
<Multi_key> <r> <c> : "♲" U2672 # в переработку!

# символы религий
<Multi_key> <plus> <plus> : "☦" U2626 # православный крест
<Multi_key> <parenleft> <asterisk> : "☪" U262A # звезда и полумесяц
<Multi_key> <b> <b> : "卍" U534D # знак Будды
<Multi_key> <B> <B> : "☸" U3638 # колесо Дхармы
<Multi_key> <6> <6> : "✡" U2721 # звезда Давида
<Multi_key> <y> <y> : "☯" U262F # Ин-Янь


# Arrows
# Simple
<Multi_key> <less> <minus>	 	: "←" U2190 # LEFTWARDS ARROW
<Multi_key> <l> <asciicircum>		: "↑" U2191 # UPWARDS ARROW
<Multi_key> <minus> <greater> 		: "→" U2192 # RIGHTWARDS ARROW
<Multi_key> <l> <v> 			: "↓" U2193 # DOWNWARDS ARROW
<Multi_key> <minus> <less> <greater>  	: "↔" U2194 # LEFT RIGHT ARROW
<Multi_key> <minus> <less> <greater> 	: "↔" U2194 # LEFT RIGHT ARROW
<Multi_key> <v> <asciicircum> 		: "↕" U2195 # UP DOWN ARROW
<Multi_key> <asciicircum> <v>   	: "↕" U2195 # UP DOWN ARROW
<Multi_key> <backslash> <asciicircum> 	: "↖" U2196 # NORTH WEST ARROW
<Multi_key> <slash> <asciicircum> 	: "↗" U2197 # NORTH EAST ARROW
<Multi_key> <backslash> <v> 		: "↘" U2198 # SOUTH EAST ARROW
<Multi_key> <slash> <v> 		: "↙" U2199 # SOUTH WEST ARROW

# Double
<Multi_key> <less> <equal> 		: "⇐" U21D0 # LEFTWARDS DOUBLE ARROW
<Multi_key> <bar> <asciicircum> 	: "⇑" U21D1 # UPWARDS DOUBLE ARROW
<Multi_key> <equal> <greater> 		: "⇒" U21D2 # RIGHTWARDS DOUBLE ARROW
<Multi_key> <bar> <v> 			: "⇓" U21D3 # DOWNWARDS DOUBLE ARROW
<Multi_key> <less> <greater> <equal> 	: "⇔" U21D4 # LEFT RIGHT DOUBLE ARROW
<Multi_key> <equal> <less> <greater> 	: "⇔" U21D4 # LEFT RIGHT DOUBLE ARROW

# Music
<Multi_key> <numbersign> <4>            : "♩" U2669 # QUARTER NOTE
<Multi_key> <numbersign> <8>            : "♪" U266A # EIGHTH NOTE
<Multi_key> <numbersign> <minus> <8>    : "♫" U266B # BEAMED EIGHT NOTES
<Multi_key> <numbersign> <1> <6>        : "♬" U266C # SIXTEENTH NOTES
<Multi_key> <numbersign> <F>            : "𝄢" U1D122 # MUSICAL SYMBOL F CLEF
<Multi_key> <numbersign> <?>            : "𝄢" U1D122 # MUSICAL SYMBOL F CLEF
<Multi_key> <numbersign> <G>            : "𝄞" U1D11E # MUSICAL SYMBOL G CLEF
<Multi_key> <numbersign> <b>            : "♭" U266D # FLAT
<Multi_key> <numbersign> <equal>        : "♮" U266E # NATURAL
<Multi_key> <numbersign> <numbersign>   : "♯" U266F # SHARP
<Multi_key> <numbersign> <x>            : "𝄪" U1D12A # MUSICAL SYMBOL DOUBLE SHARP
<Multi_key> <numbersign> <B>            : "𝄫" U1D12B # MUSICAL SYMBOL DOUBLE FLAT

README.md

Custom ~/.XCompose

Put this .XCompose file into your home directory and use additional Compose sequences.

See also (in Russian)

• s.arboreus.com/2008/02/compose.html
• shoorick.livejournal.com/tag/compose