The usage of this Phoenician letter for any vowel seem is mainly because of the early Greek alphabets, which adopted the letter "omicron" to represent the vowel /o/. The letter was adopted with the value while in the Outdated Italic alphabets, such as the early Latin alphabet. Sensible Vocabulary: https://musicainfantil99875.tribunablog.com/facts-about-o-sapinho-e-a-borboleta-revealed-51465499