The use of this Phoenician letter for a vowel sound is due to the early Greek alphabets, which adopted the letter "omicron" to represent the vowel . The letter was adopted with the value in the Old Italic alphabets, including the early Latin alphabet. In Greek, a variation of the form later came to differentiate this long sound (omega, meaning "large O") from the short o (Omicron, meaning "small o"). The Greek omicron gave rise to the corresponding Cyrillic letter O.
The use of this Phoenician letter for a vowel sound is due to the early Greek alphabets, which adopted the letter "omicron" to represent the vowel . The letter was adopted with the value in the Old Italic alphabets including the early Latin alphabet. In Greek, a variation of the form later came to differentiate this long sound (o,mega, meaning "large O") from the short o (Omicron, meaning "small o") The Greek omic.ron gave rise to the corresponding Cyrillic letter O.