The use of this Phoenician letter to get a vowel sound 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 value in the Aged Italic alphabets, including the early Latin alphabet. Following, click https://manuelnwbfj.bloggip.com/37218505/everything-about-o-sapinho-e-a-borboleta