Where symbols appear in pairs, the one to the right represents
a rounded vowel. Vowel length is indicated by appending ː. A back vowel is a type of vowel sound used in some spoken languages. The defining characteristic of a back vowel is that the tongue is positioned as far back as possible in the mouth without creating a constriction that would be classified as a consonant. Back vowels are sometimes also called dark vowels because they are perceived as sounding darker than the front vowels.[1] The back vowels identified by the International Phonetic Alphabet are:
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