The usage of this Phoenician letter for just a vowel seem is because of the early Greek alphabets, which adopted the letter "omicron" to symbolize the vowel /o/. The letter was adopted with the value while in the Previous Italic alphabets, such as the early Latin alphabet. Good Vocabulary: https://musica-infantil88765.blogunok.com/37248985/5-tips-about-musica-infantil-you-can-use-today