Omicron

Omicron (uppercase Ο, lowercase ο, literally "small o": όμικρον < ὂ μικρόν - ò mikrón, micron meaning 'small' in contrast to omega) is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. This letter is derived from the Phoenician letter ayin . In classical Greek, omicron represented the sound [o] in contrast to omega [ɔː] and ου [oː]. In modern Greek, omicron represents the mid back rounded vowel /o̞/ . Letters that arose from omicron include Roman O and Cyrillic O.

The upper-case letter of omicron (O) was originally used in mathematics as a symbol for Big O notation (representing a function's asymptotic growth rate), but has fallen out of favor because omicron is indistinguishable from the Latin letter O and easily confused with the digit zero (0).

Omicron is used to designate the fifteenth star in a constellation group, its ordinal placement a function of both magnitude and position.[1][2] Such stars include Omicron Andromedae, Omicron Ceti, and Omicron Persei.

Character encodings

  • Greek Omicron / Coptic O[3]
CharacterΟο
Unicode nameGREEK CAPITAL LETTER OMICRONGREEK SMALL LETTER OMICRONCOPTIC CAPITAL LETTER OCOPTIC SMALL LETTER O
Encodingsdecimalhexdecimalhexdecimalhexdecimalhex
Unicode927U+039F959U+03BF11422U+2C9E11423U+2C9F
UTF-8206 159CE 9F206 191CE BF226 178 158E2 B2 9E226 178 159E2 B2 9F
Numeric character reference&#927;&#x39F;&#959;&#x3BF;&#11422;&#x2C9E;&#11423;&#x2C9F;
Named character reference&Omicron;&omicron;
DOS Greek1428E166A6
DOS Greek-2190BE233E9
Windows 1253207CF239EF
  • Mathematical Omicron[4]

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 text style.

Character𝚶𝛐𝛰𝜊𝜪𝝄
Unicode nameMATHEMATICAL BOLD
CAPITAL OMICRON
MATHEMATICAL BOLD
SMALL OMICRON
MATHEMATICAL ITALIC
CAPITAL OMICRON
MATHEMATICAL ITALIC
SMALL OMICRON
MATHEMATICAL BOLD ITALIC
CAPITAL OMICRON
MATHEMATICAL BOLD ITALIC
SMALL OMICRON
Encodingsdecimalhexdecimalhexdecimalhexdecimalhexdecimalhexdecimalhex
Unicode120502U+1D6B6120528U+1D6D0120560U+1D6F0120586U+1D70A120618U+1D72A120644U+1D744
UTF-8240 157 154 182F0 9D 9A B6240 157 155 144F0 9D 9B 90240 157 155 176F0 9D 9B B0240 157 156 138F0 9D 9C 8A240 157 156 170F0 9D 9C AA240 157 157 132F0 9D 9D 84
UTF-1655349 57014D835 DEB655349 57040D835 DED055349 57072D835 DEF055349 57098D835 DF0A55349 57130D835 DF2A55349 57156D835 DF44
Numeric character reference&#120502;&#x1D6B6;&#120528;&#x1D6D0;&#120560;&#x1D6F0;&#120586;&#x1D70A;&#120618;&#x1D72A;&#120644;&#x1D744;
Character𝝤𝝾𝞞𝞸
Unicode nameMATHEMATICAL SANS-SERIF
BOLD CAPITAL OMICRON
MATHEMATICAL SANS-SERIF
BOLD SMALL OMICRON
MATHEMATICAL SANS-SERIF
BOLD ITALIC CAPITAL OMICRON
MATHEMATICAL SANS-SERIF
BOLD ITALIC SMALL OMICRON
Encodingsdecimalhexdecimalhexdecimalhexdecimalhex
Unicode120676U+1D764120702U+1D77E120734U+1D79E120760U+1D7B8
UTF-8240 157 157 164F0 9D 9D A4240 157 157 190F0 9D 9D BE240 157 158 158F0 9D 9E 9E240 157 158 184F0 9D 9E B8
UTF-1655349 57188D835 DF6455349 57214D835 DF7E55349 57246D835 DF9E55349 57272D835 DFB8
Numeric character reference&#120676;&#x1D764;&#120702;&#x1D77E;&#120734;&#x1D79E;&#120760;&#x1D7B8;

References

  1. Martin, Martha Evans (1907). The Friendly Stars (1st ed.). New York: Harper & Brothers Publishers. p. 135. Retrieved 8 February 2016.
  2. Wilk, Stephen R. (2007). Medusa: Solving the Mystery of the Gorgon (1st ed.). New York: Oxford University Press. p. 201. ISBN 9780199887736. Retrieved 8 February 2016.
  3. "Greek and Coptic (Range: 0370–03FF)" (PDF). The Unicode Standard, Ver. 8.0. Unicode, Inc. 2015. Retrieved 8 February 2016.
  4. "Mathematical Alphanumeric Symbols (Range: 1D400–1D7FF)" (PDF). The Unicode Standard, Ver. 8.0. Unicode, Inc. 2015. Retrieved 8 February 2016.
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