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")
Mid central vowel diacritic, . Languages may have a mid central rounded vowel (a rounded ), distinct from both the close-mid and open-mid vowels. However, since no language is known to distinguish all three, there is no separate IPA symbol for the mid vowel, and the symbol for the close-mid central rounded vowel is generally used instead. If precision is desired, the lowering diacritic can be used: . This vowel can also be represented by adding the more rounded diacritic to the schwa symbol, or by combining the raising diacritic with the open-mid central rounded vowel symbol, although it is rare to use