Using this Phoenician letter for just a vowel seem is due to the early Greek alphabets, which adopted the letter "omicron" to signify the vowel /o/. The letter was adopted with the value inside the Outdated Italic alphabets, including the early Latin alphabet. Future, simply click the Symbol button https://manuelnwbfj.bloggip.com/37218505/everything-about-o-sapinho-e-a-borboleta