Open back rounded vowel

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 $\langle\rangle$. 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 $\langle\rangle$, 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 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 is slight, and in English at least it is sulcal or "grooved". However, Assamese has an "over-rounded" with rounding as strong as that for.