Omicron

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Image:Omicron uc lc.svg
Greek alphabet
Αα Alpha	Νν Nu
Ββ Beta	Ξξ Xi
Γγ Gamma	Οο Omicron
Δδ Delta	Ππ Pi
Εε Epsilon	Ρρ Rho
Ζζ Zeta	Σσ Sigma
Ηη Eta	Ττ Tau
Θθ Theta	Υυ Upsilon
Ιι Iota	Φφ Phi
Κκ Kappa	Χχ Chi
Λλ Lambda	Ψψ Psi
Μμ Mu	Ωω Omega
Obsolete letters
Ϝϝ Digamma	Ϸϸ Sho
Ϛϛ Stigma	Ϙϙ Qoppa
Ϻϻ San	Ϡϡ Sampi
Greek diacritics

Omicron (uppercase Ο, lowercase ο, literally "small o": o mikron, 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. It is rarely used in mathematics because it is indistinguishable from the Latin letter O and easily confused with the digit 0. This letter is equal to the Phoenician letter Ayin. The sound procuced by the modern Greek Omicron is most similar to the modern English sound "aw", as in 'law'.

In Unicode the capital letter is codepoint U+039F and the lowercase is U+03BF.

The upper-case letter of omicron (O) was originally used as a symbol for Big O notation, representing the asymptotic rate of growth of a function in mathematics.

als:Ο

ar:اوميكرون (حرف إغريقي) arc:Ο br:Omikron (lizherenn) bg:Омикрон ca:Òmicron cy:Omicron da:Omikron de:Omikron el:Όμικρον es:Ο eu:Omicron fr:Omicron ga:Oimeacrón gd:Omicron gl:Omicrón ko:Ο id:Omikron it:Omicron (lettera) he:אומיקרון ka:ომიკრონი (ასო) ht:Ο ku:Omikron la:Omicron hu:Omikron ms:Omikron nl:Omikron ja:Ο no:Omikron nds:Omikron pl:Omikron pt:Ο ru:Омикрон (буква) sk:Omikrón sl:Omikron fi:Omikron sv:Omikron th:โอไมครอน tr:Ο zh:Ο