“omicron” or “omikron”, fifteenth letter of the Greek alphabet
Also known as omikron · omicron · Ο · ο
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10 identifiers linking Ο/ο across the web's reference databases
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Omicron 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 ⟨ου⟩, 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 οὖ, but it was later changed to ὂ μικρόν in the Middle Ages to distinguish the letter from omega ⟨ω⟩, whose name means 'big o', as both letters had come to be pronounced. In modern Greek, its name has fused into όμικρον. In the system of Greek numerals, it has a value of 70.