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Omega (/ˈoʊmɪɡə, oʊˈmiːɡə, oʊˈmɛɡə, oʊˈmeɪɡə/;^{[1]}^{[2]} capital: Ω, lowercase: ω; Ancient Greek ὦ, later ὦ μέγα, Modern Greek ωμέγα) is the 24th and last letter in the Greek alphabet. In the Greek numeric system/isopsephy (gematria), it has a value of 800. The word literally means "great O" (ō mega, mega meaning "great"), as opposed to omicron, which means "little O" (o mikron, micron meaning "little").^{[3]}
In phonetic terms, the Ancient Greek Ω is a long openmid o [ɔː], comparable to the vowel of English raw^{[clarification needed]}. In Modern Greek, Ω represents the mid back rounded vowel {{IPA/o̞/, the same sound as omicron. The letter omega is transcribed ō or simply o.
As the final letter in the Greek alphabet, omega is often used to denote the last, the end, or the ultimate limit of a set, in contrast to alpha, the first letter of the Greek alphabet; see Alpha and Omega.
Ω was not part of the early (8th century BC) Greek alphabets. It was introduced in the late 7th century BC in the Ionian cities of Asia Minor to denote a long openmid back rounded vowel [ɔː]. It is a variant of omicron (Ο), broken up at the side (), with the edges subsequently turned outward (, , , ).^{[4]} The Dorian city of Knidos as well as a few Aegean islands, namely Paros, Thasos and Melos, chose the exact opposite innovation, using a brokenup circle for the short and a closed circle for the long /o/.^{[4]}
The name Ωμέγα is Byzantine; in Classical Greek, the letter was called ō (ὦ), whereas the omicron was called ou (οὖ).^{[5]} The modern lowercase shape goes back to the uncial form , a form that developed during the 3rd century BC in ancient handwriting on papyrus, from a flattenedout form of the letter () that had its edges curved even further upward.^{[6]}
In addition to the Greek alphabet, Omega was also adopted into the early Cyrillic alphabet. See Cyrillic omega (Ѡ, ѡ). A Raetic variant is conjectured to be at the origin or parallel evolution of the Elder Futhark ᛟ.
Omega was also adopted into the Latin alphabet, as a letter of the 1982 revision to the African reference alphabet. It has had little use. See Latin omega.
The uppercase letter Ω is used as a symbol:
The minuscule letter ω is used as a symbol:
Preview  Ω  ω  Ⲱ  ⲱ  

Unicode name  GREEK CAPITAL LETTER OMEGA  GREEK SMALL LETTER OMEGA  COPTIC CAPITAL LETTER OOU  COPTIC SMALL LETTER OOU  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  937  U+03A9  969  U+03C9  11440  U+2CB0  11441  U+2CB1 
UTF8  206 169  CE A9  207 137  CF 89  226 178 176  E2 B2 B0  226 178 177  E2 B2 B1 
Numeric character reference  Ω 
Ω 
ω 
ω 
Ⲱ 
Ⲱ 
ⲱ 
ⲱ 
Named character reference  Ω, Ω  ω  
DOS Greek  151  97  224  E0  
DOS Greek2  213  D5  250  FA  
Windows 1253  217  D9  249  F9  
TeX  \Omega  \omega 
^{[12]}
Preview  Ѡ  ѡ  ꙻ  

Unicode name  CYRILLIC CAPITAL LETTER OMEGA  CYRILLIC SMALL LETTER OMEGA  COMBINING CYRILLIC LETTER OMEGA  
Encodings  decimal  hex  decimal  hex  decimal  hex 
Unicode  1120  U+0460  1121  U+0461  42619  U+A67B 
UTF8  209 160  D1 A0  209 161  D1 A1  234 153 187  EA 99 BB 
Numeric character reference  Ѡ 
Ѡ 
ѡ 
ѡ 
ꙻ 
ꙻ 
Preview  Ѻ  ѻ  Ꙍ  ꙍ  

Unicode name  CYRILLIC CAPITAL LETTER ROUND OMEGA  CYRILLIC SMALL LETTER ROUND OMEGA  CYRILLIC CAPITAL LETTER BROAD OMEGA  CYRILLIC SMALL LETTER BROAD OMEGA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  1146  U+047A  1147  U+047B  42572  U+A64C  42573  U+A64D 
UTF8  209 186  D1 BA  209 187  D1 BB  234 153 140  EA 99 8C  234 153 141  EA 99 8D 
Numeric character reference  Ѻ 
Ѻ 
ѻ 
ѻ 
Ꙍ 
Ꙍ 
ꙍ 
ꙍ 
Preview  ɷ  Ꞷ  ꞷ  

Unicode name  LATIN SMALL LETTER CLOSED OMEGA  LATIN CAPITAL LETTER OMEGA  LATIN SMALL LETTER OMEGA  
Encodings  decimal  hex  decimal  hex  decimal  hex 
Unicode  631  U+0277  42934  U+A7B6  42935  U+A7B7 
UTF8  201 183  C9 B7  234 158 182  EA 9E B6  234 158 183  EA 9E B7 
Numeric character reference  ɷ 
ɷ 
Ꞷ 
Ꞷ 
ꞷ 
ꞷ 
Preview  ⍵  ⍹  Ω  ℧  

Unicode name  APL FUNCTIONAL SYMBOL OMEGA  APL FUNCTIONAL SYMBOL OMEGA UNDERBAR  OHM SIGN  INVERTED OHM SIGN  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  9077  U+2375  9081  U+2379  8486  U+2126  8487  U+2127 
UTF8  226 141 181  E2 8D B5  226 141 185  E2 8D B9  226 132 166  E2 84 A6  226 132 167  E2 84 A7 
Numeric character reference  ⍵ 
⍵ 
⍹ 
⍹ 
Ω 
Ω 
℧ 
℧ 
Named character reference  ℧ 
Preview  𝛀  𝛚  𝛺  𝜔  𝜴  𝝎  

Unicode name  MATHEMATICAL BOLD CAPITAL OMEGA 
MATHEMATICAL BOLD SMALL OMEGA 
MATHEMATICAL ITALIC CAPITAL OMEGA 
MATHEMATICAL ITALIC SMALL OMEGA 
MATHEMATICAL BOLD ITALIC CAPITAL OMEGA 
MATHEMATICAL BOLD ITALIC SMALL OMEGA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120512  U+1D6C0  120538  U+1D6DA  120570  U+1D6FA  120596  U+1D714  120628  U+1D734  120654  U+1D74E 
UTF8  240 157 155 128  F0 9D 9B 80  240 157 155 154  F0 9D 9B 9A  240 157 155 186  F0 9D 9B BA  240 157 156 148  F0 9D 9C 94  240 157 156 180  F0 9D 9C B4  240 157 157 142  F0 9D 9D 8E 
UTF16  55349 57024  D835 DEC0  55349 57050  D835 DEDA  55349 57082  D835 DEFA  55349 57108  D835 DF14  55349 57140  D835 DF34  55349 57166  D835 DF4E 
Numeric character reference  𝛀 
𝛀 
𝛚 
𝛚 
𝛺 
𝛺 
𝜔 
𝜔 
𝜴 
𝜴 
𝝎 
𝝎 
Preview  𝝮  𝞈  𝞨  𝟂  

Unicode name  MATHEMATICAL SANSSERIF BOLD CAPITAL OMEGA 
MATHEMATICAL SANSSERIF BOLD SMALL OMEGA 
MATHEMATICAL SANSSERIF BOLD ITALIC CAPITAL OMEGA 
MATHEMATICAL SANSSERIF BOLD ITALIC SMALL OMEGA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120686  U+1D76E  120712  U+1D788  120744  U+1D7A8  120770  U+1D7C2 
UTF8  240 157 157 174  F0 9D 9D AE  240 157 158 136  F0 9D 9E 88  240 157 158 168  F0 9D 9E A8  240 157 159 130  F0 9D 9F 82 
UTF16  55349 57198  D835 DF6E  55349 57224  D835 DF88  55349 57256  D835 DFA8  55349 57282  D835 DFC2 
Numeric character reference  𝝮 
𝝮 
𝞈 
𝞈 
𝞨 
𝞨 
𝟂 
𝟂 
These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate the style of the text.
Wikimedia Commons has media related to Omega (letter). 
Look up Ω or ω in Wiktionary, the free dictionary. 