The open back rounded vowel, or low back rounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɒ⟩. This is called turned script a, because it is a rotated version of script a, so-called because it lacks the extra stroke on top of a printed 'a'. Turned script a, which has its linear stroke on the left, should not be confused with script a ⟨ɑ⟩, which has its linear stroke on the right and corresponds to an unrounded version of this vowel, the open back unrounded vowel. A well rounded [ɒ] is rare, though it is found in some varieties of English. In most languages with this vowel, such as English and Persian, the rounding of [ɒ] is slight, and in English at least it is sulcal or "grooved". However, Assamese has an "over-rounded" [ɒ̹] with rounding as strong as that for [u].
The IPA prefers terms "close" and "open" for vowels, and the name of the article follows this. However, a large number of linguists, perhaps a majority, prefer the terms "high" and "low", and these are the only terms found in introductory textbooks on phonetics such as those by Peter Ladefoged.
- Its vowel height is open, also known as low, which means the tongue is positioned as far as possible from the roof of the mouth – that is, as low as possible in the mouth.
- Its vowel backness is back, which means the tongue is positioned as far back as possible in the mouth without creating a constriction that would be classified as a consonant.
- It's rounded, which means that the lips are rounded rather than spread or relaxed.
See also 
- Mesthrie, Rajend, ed. (2002), Language in South Africa, Cambridge University Press, ISBN 9780521791052
- Rafel, Joaquim (1999), Aplicació al català dels principis de transcripció de l'Associació Fonètica Internacional (3rd ed.), Barcelona: Institut d'Estudis Catalans, ISBN 84-7283-446-8
- Recasens, Daniel (1996), Fonètica descriptiva del català: assaig de caracterització de la pronúncia del vocalisme i el consonantisme català al segle XX (2nd ed.), Barcelona: Institut d'Estudis Catalans, ISBN 978-84-7283-312-8
- Roach, Peter (2004), "British English: Received Pronunciation", Journal of the International Phonetic Association 34 (2): 239–245, doi:10.1017/S0025100304001768
- Szende, Tamás (1994), "Hungarian", Journal of the International Phonetic Alphabet 24 (2): 91–94, doi:10.1017/S0025100300005090