There is uncertainty, too, about the corresponding close back rounded vowels.

In some accents - particularly London ones - we often find a close back rounded vowel instead.

Weak syllables with close back rounded vowels are not so commonly found.

In most languages, close back rounded vowels are pronounced with protruded lips.

In most languages it is a 'labialized velar approximant' (), and the semivowel counterpart of the close back rounded vowel .

The close back rounded vowel, or high back rounded vowel, is a type of vowel sound, used in many spoken languages.

Words which have the o sound in standard French are pronounced with a close back rounded vowel, resulting in, for example, un houmme (man), une poumme (apple).

In Polish there are two graphemes that realise the close back rounded vowel phoneme; this is a remnant from Old Polish phonology, where the diacritic-o (ó) was used to express a long close mid rounded vowel.

The same thing that happened with /e/ in the example of júri/jure happened to the letter /o/, that becomes a close back rounded vowel in some cases, but, due to the Hispanic influence, never represents that sounds in some Southern Brazilian.