Close Back Rounded Vowel - Close Back Compressed Vowel

Close back compressed vowel
ɯᵝ

Some languages, such as Japanese listen and Swedish, are found with a close back vowel that has a distinct type of rounding, called compressed or exolabial. No language is known to contrast this with the more typical protruded (endolabial) close back vowel.

There is no dedicated diacritic for compression in the IPA. However, the compression of the lips can be shown with the letter ⟨β⟩ as ⟨ɯ͡β̞⟩ (simultaneous and labial compression) or ⟨ɯᵝ⟩ ( modified with labial compression). The spread-lip diacritic ⟨ ͍ ⟩ may also be used with a rounded vowel letter ⟨u͍⟩ as an ad hoc symbol.

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