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 |
 San |
 Sampi |
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| 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. In modern Greek, Omicron represents the sound IPA: [ɔː].
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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