is uncommon as a
phoneme in
Indo-European languages, occurring most commonly in some
Slavic languages, such as
Belarusian and
Russian (see
ы). However, it is very common as a separate phoneme in the indigenous languages of the
Americas and is often in phonemic contrast with other close vowels such as and both in modern living languages as well as reconstructed
proto-languages (such as
Proto-Uto-Aztecan). Campbell, Kaufman, and Smith-Stark identify the presence of this vowel phoneme as an
areal feature of a
Mesoamerican
Sprachbund (although that is not a defining feature of the entire area). The sound of
Polish is often represented as , but actually it is a
close-mid advanced central unrounded vowel, more narrowly transcribed . Similarly,
European Portuguese unstressed , often represented as , is actually a
near-close near-back unrounded vowel, more narrowly transcribed using
ad hoc symbols such as (
mid-centralized), (
fronted) and (
less rounded, i.e. unrounded). ==Near-close central unrounded vowel==