Open back unrounded vowel

The open back unrounded vowel, or low back unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɑ⟩, and the equivalent X-SAMPA symbol is A. The letter ⟨ɑ⟩ is called script a because it lacks the extra hook on top of a printed letter a, which corresponds to a different vowel, the open front unrounded vowel. Script a, which has a full length linear stroke on its right, should not be confused with turned script a, ɒ, which has the linear stroke on its left and corresponds to a rounded version of this vowel, the open back rounded vowel.

In some languages (such as Azerbaijani, Estonian, Luxembourgish and Toda) there is the near-open back unrounded vowel (a sound between cardinal [ɑ] and [ʌ]), which can be transcribed in IPA with ⟨ɑ̝⟩ or ⟨ʌ̞⟩.