The use of this Phoenician letter for just a vowel seem is due to the early Greek alphabets, which adopted the letter "omicron" to symbolize the vowel /o/. The letter was adopted with the value while in the Outdated Italic alphabets, including the early Latin alphabet. Spotify is unavailable https://eduardozhlps.bloggazza.com/36052266/facts-about-o-sapinho-e-a-borboleta-revealed