IPA number 313 415 | ||
The open central rounded vowel, or low central rounded vowel, is a type of vowel sound, used in few spoken languages. While the International Phonetic Alphabet officially has no dedicated letter for this sound between front [ɶ] and back [ɒ], it is normally written ⟨ɒ⟩. If precision is required, it can be specified by using diacritics, such as centralized ⟨ɒ̈⟩, centralized ⟨ɶ̈⟩ or retracted ⟨ɶ̠⟩, but this is not common.
The IPA prefers terms "close" and "open" for vowels, and the name of the article follows this. However, a large number of linguists, perhaps a majority, prefer the terms "high" and "low".
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References
Open central rounded vowel Wikipedia(Text) CC BY-SA