The open back rounded vowel, or low back rounded vowel, is a type of vowel sound, used in some spokenlanguages. 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".
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. Note that unrounded back vowels tend to be centralized, which means that often they are in fact near-back.
It's rounded, which means that the lips are rounded rather than spread or relaxed.
Engstrand, Olle (1999), "Swedish", Handbook of the International Phonetic Association: A Guide to the usage of the International Phonetic Alphabet., Cambridge: Cambridge University Press, p. 140–142, ISBN0-521-63751-1
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, ISBN978-84-7283-312-8