The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɵ⟩, a lowercase barred letter o.

The Unicode code point is U+019F Ɵ LATIN CAPITAL LETTER O WITH MIDDLE TILDE.

This vowel occurs in Cantonese, Dutch, French, Russian and Swedish as well as in a number of English dialects as a realization of /ʊ/ (as in foot), /ɜː/ (as in nurse) or /oʊ/ (as in goat).

The close-mid central protruded vowel is typically transcribed in IPA simply as ⟨ɵ⟩, and that is the convention used in this article.

Because central rounded vowels are assumed to have protrusion, and few descriptions cover the distinction, some of the following may actually have compression.