<P> In the International Phonetic Alphabet, ⟨ y ⟩ corresponds to the close front rounded vowel, and the related character ⟨ ʏ ⟩ corresponds to the near - close near - front rounded vowel . </P> <P> In mathematics, y is commonly used as the name for a dependent variable or unknown . </P> <P> In Japan, Y is a symbol used for resale price maintenance . </P> <Ul> <Li> Y with diacritics: Ý ý Ỳ ỳ Ŷ ŷ Ÿ ÿ Ỹ ỹ Ẏ ẏ Ỵ ỵ ẙ Ỷ ỷ Ȳ ȳ Ɏ ɏ Ƴ ƴ </Li> <Li> ʎ and ʏ are used in the International Phonetic Alphabet </Li> <Li> U + AB5A ꭚ LATIN SMALL LETTER Y WITH SHORT RIGHT LEG is used in the Teuthonista phonetic transcription system </Li> <Li> y is used for phonetic transcription </Li> <Li> Ỿ ỿ: Y with loop is used by some Welsh medievalists to indicate the schwa sound of <y> </Li> </Ul>

When did the letter y become a vowel