Vowel in Creek, the letter "V" stands for . There is not necessarily a direct one-to-one correspondence between the vowel sounds of a language and the vowel letters. Many languages that use a form of the Latin alphabet have more vowel sounds than can be represented by the standard set of five vowel letters. In English spelling, the five letters "A" "E" "I" "O" and "U" can represent a variety of vowel sounds, while the letter "Y" frequently represents vowels (as in e.g., "gym", "happy", or the diphthongs in "cry", "thyme"); "W" is used in representing some diphthongs (as in "cow")
Close back rounded vowel such as Japanese and Swedish, have a close back vowel that has a distinct type of rounding, called "compressed" or "exolabial". Only Shanghainese is known to contrast it with the more typical "protruded" (endolabial) close back vowel, but the height of both vowels varies from close to close-mid. There is no dedicated diacritic for compression in the IPA. However, compression of the lips can be shown with the letter as (simultaneous and labial compression) or ( modified with labial compression). The spread-lip diacritic may also be used with a rounded vowel letter as an "ad hoc" symbol, but 'spread' technically