Open o or turned c (majuscule: Ɔ, minuscule: ɔ) is a letter of the extended Latin alphabet. In the International Phonetic Alphabet, it represents the open-mid back rounded vowel. It is used in the orthographies of many African languages using the African reference alphabet. The Yucatec Maya language used Ɔ to transcribe the alveolar ejective affricate consonant in the orthography of the Colonial period. Now dz or tsʼ is preferred.

Unicode

On the macOS US Extended keyboard, ɔ and Ɔ can be typed with Option followed by c or C.

Related characters

Descendants and related characters in the Latin alphabet

Similar looking letters

Open o looks like a reversed letter 'C'. Claudius introduced a Ɔ (the antisigma) with the intention of replacing bs and ps. The Scandinavian explanatory symbol (forklaringstegnet) can be typeset using the open o followed by a colon, thus: ɔ:. It is used to mean "namely", "id est", "scilicet" or similar. This letter is often used to refer to the Copyleft official sign, which looks like an open o with a circle around it.