The use of this Phoenician letter for any vowel sound is because of the early Greek alphabets, which adopted the letter "omicron" to signify the vowel /o/. The letter was adopted with the worth from the Outdated Italic alphabets, including the early Latin alphabet. Following, click the Symbol button https://israelyeinp.blogocial.com/the-smart-trick-of-musica-infantil-that-nobody-is-discussing-72845797