Ou is a digraph of the Latin alphabet. Digraph has several meanings: Directed graph, or digraph Digraph (orthography) Digraph (computing) This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The Latin alphabet, also called the Roman alphabet, is the most widely used alphabetic writing system in the world today. ...

French

In French, ou represents the vowel [u], as in vous [vu] "you", or the semivowel [w], as in oui [wi] "yes". Note: This page contains IPA phonetic symbols in Unicode. ... Semivowels (also called semiconsonants or glides) are vowels that function phonemically as consonants. ...

English

In English, ou represents the diphthong [aʊ], as in out [aʊt]. It is generally used before consonants, with ow being used instead before vowels and at the ends of words. The English language is a West Germanic language that originates in England. ... In phonetics, a diphthong (Greek and ending tongue positions. ...

English ou originally represented [uː], as in French, but its pronunciation has changed as part of the Great Vowel Shift. The Great Vowel Shift was a major change in the pronunciation of the English language, generally accomplished in the 15th century, although evidence suggests it began as early as the 14th century. ...