|close back rounded vowel|
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vowels beside dots are: • rounded
the close back rounded vowel, or high back rounded vowel, is a type of vowel sound used in many spoken languages. the symbol in the international phonetic alphabet that represents this sound is ⟨u⟩, and the equivalent x-sampa symbol is
in most languages, this rounded vowel is pronounced with protruded lips ('endolabial'). however, in a few cases the lips are compressed ('exolabial').
the close back rounded vowel is almost identical featurally to the labio-velar approximant [w]. [u] alternates with [w] in certain languages, such as french, and in the diphthongs of some languages, [u̯] with the non-syllabic diacritic and [w] are used in different transcription systems to represent the same sound.