The modifier letter turned comma ʻ is a character found in Unicode resembling a comma that has been turned. Unlike a comma, it is a letter, not a piece of punctuation. It is used in a number of Polynesian alphabets as the letter ʻokina to represent the glottal stop, and in the Uzbek alphabet to form the letters Oʻ and Gʻ, which correspond to Ў and Ғ respectively in the Uzbek Cyrillic alphabet.
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The ʻokina (Hawaiian pronunciation: [ʔoˈkinɐ]) is the letter that transcribes the glottal stop consonant in Hawaiian. It does not have distinct uppercase and lowercase forms, and is represented electronically by the modifier letter turned comma: ʻ.
A phonemic glottal stop exists in many other Polynesian languages as well; these are usually written by a similar apostrophe-like letter.