"Ω" redirects here. For the unit of electrical resistance, see Ohm

Omega (capital: Ω, lowercase: ω; Greek ὦ, later ὦ μέγα, Modern Greek ωμέγα) is the 24th and last letter of 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").[1]

In phonetic terms, the Ancient Greek Ω is a long open-mid o [ɔː], comparable to the vowel of British English raw. In Modern Greek, Ω represents the mid back rounded vowel /o/, the same sound as omicron. The letter omega is transcribed ō or simply o.

As the last letter of 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.

History [ edit ]

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 the long half-open [ɔː]. It is a variant of omicron (Ο), broken up at the side ( ), with the edges subsequently turned outward ( , , , ).[2] The Dorian city of Knidos as well as a few Aegean islands, namely Paros, Thasos and Melos, chose the exact opposite innovation, using a broken-up circle for the short and a closed circle for the long /o/.[2]

The name Ωμέγα is Byzantine; in Classical Greek, the letter was called ō (ὦ), whereas the omicron was called ou (οὖ).[3] 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 flattened-out form of the letter ( ) that had its edges curved even further upward.[4]

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 symbol Ω (uppercase letter) [ edit ]

An alternate form of capital Ω resembles an underlined superscript omicron or some forms of Latin Q . The O and underscore may, but need not, be touching.

The uppercase letter Ω is used as a symbol:

The symbol ω (lower case letter) [ edit ]

The minuscule letter ω is used as a symbol:

Character encodings [ edit ]

Greek omega/Coptic oou [ edit ]

Character 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 UTF-8 206 169 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 DOS Greek 151 97 224 E0 DOS Greek-2 213 D5 250 FA Windows 1253 217 D9 249 F9 TeX \Omega \omega

[7]

Cyrillic omega [ edit ]

Character 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 UTF-8 209 160 D1 A0 209 161 D1 A1 234 153 187 EA 99 BB Numeric character reference Ѡ Ѡ ѡ ѡ ꙻ ꙻ

Character 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 UTF-8 209 186 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

Character 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 UTF-8 201 183 C9 B7 234 158 182 EA 9E B6 234 158 183 EA 9E B7 Numeric character reference ɷ ɷ Ꞷ Ꞷ ꞷ ꞷ

Technical omega symbols [ edit ]

Character ⍵ ⍹ 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 UTF-8 226 141 181 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 ℧ ℧

Mathematical omega [ edit ]

Character 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 UTF-8 240 157 155 128 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 UTF-16 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

Character 𝝮 𝞈 𝞨 𝟂 Unicode name MATHEMATICAL SANS-SERIF

BOLD CAPITAL OMEGA MATHEMATICAL SANS-SERIF

BOLD SMALL OMEGA MATHEMATICAL SANS-SERIF

BOLD ITALIC CAPITAL OMEGA MATHEMATICAL SANS-SERIF

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 UTF-8 240 157 157 174 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 UTF-16 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 text.

See also [ edit ]