The letter ɔ, the 'open o (or, more correctly, by printers, as the 'turned c') with a triangular colon, is used in the International Phonetic Alphabet to represent the 'open-mid back rounded vowel', the sound of 'dog', 'cough', 'off' and 'got'.
This sound may be represented in written English by the letters:
- (mostly) -o-;
- (after '-w-' and '-qu-') -a-, as in 'swan', 'want' and 'was', 'quality', 'squash' and 'squad';
- -au- (in 'laurel' and 'sausage')
Warning: some writers use ɔː to represent the sound AWE shows by ɒː (the vowel in 'all', 'caught', 'ought'. See also how AWE uses the IPA and Transcribing English vowels for an account of this.