Tillamook phonology

Internal Rounding
The "rounded" consonants (marked by ʷ), including, are not labialized&mdash;the effect is created entirely inside the mouth by cupping the tongue. Uvulars with this distinctive internal rounding have "a kind of timbre" while "rounded" front velars have  coloring. These contrast and oppose otherwise very similar segments having or  coloring&mdash;the "unrounded" consonants.

is also formed with this internal rounding instead of true labialization, making it akin to. So are vowel sounds formerly written as or, which are best characterized as the diphthong  with increasing rounding.