While there is no dedicated symbol in the International Phonetic Alphabet that represents the exact mid back rounded vowel between close-mid [o] and open-mid [ɔ], it is normally written ⟨o⟩.

Tukang Besi is a language in Sulawesi, Indonesia, with a close-mid [o].

Taba, another language in Indonesia, in the Maluku Islands, has an open-mid [ɔ].

In both languages, there is no contrast with another mid (true-mid or close-mid) vowel.

Kensiu, in Malaysia and Thailand, is highly unusual in that it contrasts true-mid vowels with close-mid and open-mid vowels without any difference in other parameters, such as backness or roundedness.