The close back unrounded vowel, or high back unrounded vowel,[1] is a type of vowel sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɯ⟩. Typographically, it is a turned letter ⟨m⟩; given its relation to the sound represented by the letter ⟨u⟩, it can be considered a ligature of 2 ⟨u⟩'s.
The close back unrounded vowel can in many cases be considered the vocalic equivalent of the voiced velar approximant [ɰ].
Its vowel height is close, also known as high, which means the tongue is positioned close to the roof of the mouth without creating a constriction that would be classified as a consonant.
Its vowel backness is back, which means the tongue is positioned back in the mouth without creating a constriction that would be classified as a consonant. Unrounded back vowels tend to be centralized, which means that often they are in fact near-back.
It is unrounded, which means that the lips are not rounded.
Possible realization of the unstressed vowel /ɯ/, which is variable in rounding and ranges from central to (more often) back and close to close-mid.[10][11] Corresponds to /əl/ in other accents. Develops from dark L; See New Zealand English phonology
Typically transcribed in IPA with ⟨ɤ⟩; can be close-mid central [ɘ] or close-mid back [ɤ] instead, depending on the speaker.[14] See Estonian phonology
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