Omicron

Article summary

Omicron ( , ; uppercase Ο, lowercase ο, ) is the fifteenth letter of the Greek alphabet. This letter is derived from the Phoenician letter ayin: . In classical Greek, omicron represented the close-mid back rounded vowel , in contrast to omega, which represented the open-mid back rounded vowel , and the digraph , which represented the long close back rounded vowel . In modern Greek, both omicron and omega represent the mid back rounded vowel . Letters that arose from omicron include Roman O and Cyrillic O and Ю. The name of the letter was originally ( ), but it was later changed to ( 'small o') in the Middle Ages to distinguish the letter from omega , whose name means 'big o', as both letters had come to be pronounced . In modern Greek, its name has fused into ( ). In the system of Greek numerals, it has a value of 70.

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