The use of this Phoenician letter for a vowel seem is mainly because of the early Greek alphabets, which adopted the letter "omicron" to stand for the vowel /o/. The letter was adopted with the worth inside the Previous Italic alphabets, such as the early Latin alphabet. Good Vocabulary: https://emilioahmpu.jiliblog.com/93544644/facts-about-o-sapinho-e-a-borboleta-revealed