Omicron 166738 221777611 2008-06-26T01:39:06Z 86.136.217.2 {{wiktionarypar2|Ο|ο}} {{Table_Greekletters|letter=omicron}} '''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 alphabet|Latin]] letter [[O]] and easily confused with the [[Numerical digit|digit]] [[0 (number)|0]]. This letter is equal to the Phoenician letter Ayin. In [[modern Greek]], Omicron represents the sound {{IPA2|ɔː}}. In [[Unicode]] the [[majuscule|capital]] letter is codepoint U+039F and the [[Lower case|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. [[Category:Greek letters]] [[Category:Vowel letters]] {{writingsystem-stub}} [[als:Ο]] [[ar:أوميكرون (حرف إغريقي)]] [[arc:Ο]] [[br:Omikron (lizherenn)]] [[bg:Омикрон]] [[ca:Òmicron]] [[cy:Omicron]] [[da:Omikron]] [[de:Omikron]] [[el:Όμικρον]] [[es:Ο]] [[eo:Omikrono]] [[eu:Omicron]] [[fr:Omicron]] [[ga:Oimeacrón]] [[gd:Omicron]] [[gl:Omicrón]] [[ko:Ο]] [[hr:Omikron]] [[id:Omikron]] [[is:Ómíkron]] [[it:Omicron (lettera)]] [[he:אומיקרון]] [[ka:ომიკრონი (ასო)]] [[ht:Ο]] [[ku:Omikron]] [[la:Omicron]] [[lt:Omikron (raidė)]] [[hu:Omikron]] [[ms:Omikron]] [[nah:Ο]] [[nl:Omikron]] [[ja:Ο]] [[no:Omikron]] [[nn:Omikron]] [[nds:Omikron]] [[pl:Omikron]] [[pt:Ο]] [[ru:Омикрон (буква)]] [[simple:Omicron]] [[sk:Omikrón]] [[sl:Omikron]] [[sh:Omikron]] [[fi:Omikron]] [[sv:Omikron]] [[th:โอไมครอน]] [[tr:Ο]] [[uk:Омікрон (літера)]] [[zh:Ο]]