====== Common Unicode Characters and Compose sequences ======

Unicode characters I use commonly, and which have no key mapped by default.
\\
Note Unicode code points (Unicode "codes") can be introduced in GNOME easily with CTRL+Shift+U followed by the hex code.

===== Dashes ("en", "em" and "horizontal bar": –, —, ―) =====

  * En dash: U+2013 => –
  * Em dash: U+2014 => —
    * Also Compose + -,-,- (Compose + 3 dashes)
  * Figure dash: U+2012 => ‒ (same width as a digit in fonts with same-width digits: «''1‒2‒3''»)
  * Horizontal bar: U+2015 => ― (hard to distinguish from em dash in most fonts/font sizes)

Ref: http://en.wikipedia.org/wiki/Dash

===== Greek letters =====

U+391 = Α, U+392 = Β, U+393 = Γ, ...
\\
\\
U+3b1 = α, U+3b2 = β, U+3b3 = γ, ...

  * Full table at wikipedia: http://en.wikipedia.org/wiki/Greek_alphabet#Greek_in_Unicode [As of 2010-03-21]

===== Assignment operator =====

U+2254 => ≔

===== Questioned equal to =====

U+225F => ≟

Unicode name ''QUESTIONED EQUAL TO'', source: http://www.w3.org/TR/MathML2/bycodes.html
\\
MathML: ''equest'', ''questeq''

See also: http://en.wikipedia.org/wiki/Unicode_mathematical_operators

===== Quotes («», ‘’, “”) =====

  * Guillemets: U+ab, U+bb => « »  (HTML: ''laquo'' and ''raquo'')
    * Also Compose, <, < and Compose, >, >
    * Also AltGr + z and AltGr + x (X-Window, layout-dependant?)
  * Typographical double: U+201c, U+201d => “ ” (HTML: ''ldquo'' and ''rdquo'')
    * Also Compose, <, ''"'' and Compose, > ''"''
    * Also AltGr + v and AltGr + b (X-Window, layout-dependant?)
  * Typographical single: U+2018, U+2019 => ‘ ’
    * Also Compose, <, ' and Compose, >, '
    * Also AltGr + Shift + v and AltGr + Shft + b (X-Window, layout-dependant?

Refs:
  * http://en.wikipedia.org/wiki/Guillemets#Typing_.22.C2.AB.22_and_.22.C2.BB.22_on_computers
  * http://en.wikipedia.org/wiki/Quotation_mark#Typing_quotation_marks_on_a_computer_keyboard

===== Spaces =====

Obviously they're the same width in fixed fonts.

  * Non-breaking (HTML's &nbsp;): U+a0 => [ ]
  * Hair space: U+200a => [ ]
  * Thin space: U+2009 => [ ] (HTML: ''thinsp'')
  * En space/Nut: U+2002 => [ ] (width of 1 en, half em), (HTML: ''ensp'')
  * Em space/Mutton: U+2003 => [ ] (width of 1 em), (HTML: ''emsp'')
  * Figure space: U+2007 => [ ] (same width as a digit in fonts with same-width digits: «''1 2 3''», non-breaking)

  * Space Symbol: U+2420 => ␠
  * Open box symbol: U+2423 => ␣

Ref and more types of spaces: http://en.wikipedia.org/wiki/Space_%28punctuation%29#Table_of_spaces

===== Per thousand & per ten thousand (‰, ‱) =====

  * Permille: U+2030 => ‰
    * Also Compose + %,o (Compose, Percent, letter O)
  * Permyriad: U+2031 => ‱

===== Copyright, Trademark, Registered Trademark (©, ™, ®)=====

  * Copyright: U+a9 => ©
    * Also Compose, c, o and Compose, c, 0 (Compose, letter C, letter O or number 0)
  * Trademark: U+2122 => ™
    * Also Compose, t, m
  * Registered trademark: U+ae => ®

===== Peseta (₧) =====

U+20a7 => ₧ (looks awful in most fonts, not in all)

Ref: http://en.wikipedia.org/wiki/Spanish_peseta#Symbol