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")
Vowel harmony (usually consonant segments). In other words, "harmony" refers to the assimilation of sounds that are "not" adjacent to each other. For example, a vowel at the beginning of a word can trigger assimilation in a vowel at the end of a word. The assimilation occurs across the entire word in many languages. This is represented schematically in the following diagram: In the diagram above, the V (type-a vowel) causes the following V (type-b vowel) to assimilate and become the same type of vowel (and thus they become, metaphorically, "in harmony"). The vowel that causes the vowel assimilation is frequently termed