Omicron
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| Greek alphabet | |||||
|---|---|---|---|---|---|
| Αα Alpha | Νν Nu | ||||
| Ββ Beta | Ξξ Xi | ||||
| Γγ Gamma | Οο Omicron | ||||
| Δδ Delta | Ππ Pi | ||||
| Εε Epsilon | Ρρ Rho | ||||
| Ζζ Zeta | Σσς 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 | |||||
 Digamma |
 Qoppa |
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 San |
 Sampi |
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| Other characters | |||||
 Stigma |
 Sho |
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 Heta |
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| Greek diacritics | |||||
Omicron or Omikron (uppercase Ο, lowercase ο, literally "small o" : Όμικρον, 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. In modern Greek, Omicron represents the sound IPA: [ɔː]. Letters that arose from omicron include Roman O and Cyrillic O.
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.
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