Voiced bilabial trill

The voiced bilabial trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents the sound is ⟨ʙ⟩, a small capital version of the Latin letter b, and the equivalent X-SAMPA symbol is.

Features
Features of the voiced bilabial trill: In most instances, it is only found as the trilled release of a prenasalized stop.

Occurrences
The Knorkator song "[Buchstabe]" (the actual title is a glyph) on the 1999 album Hasenchartbreaker uses a similar sound (though linguolabial instead of bilabial) to replace "br" in a number of German words (e.g. for Bratkartoffeln).

Phonology
In many of the languages in which the bilabial trill occurs, it occurs only as part of a prenasalized bilabial stop with trilled release,. That developed historically from a prenasalized stop before a relatively high back vowel like. In such instances, the sounds are usually still limited to the environment of a following. However, the trills in Mangbetu may precede any vowel and are sometimes preceded by only a nasal.