The bilabial trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ʙ (a character used as a lower case form of B in Jaŋalif and similar alphabets), and the equivalent X-SAMPA symbol is B\.
In many of the languages where the bilabial trill occurs, it occurs only as part of a prenasalised bilabial stop with trilled release, [mbʙ]. This developed historically from a prenasalized stop before a relatively high back vowel, such as [mbu]. In such instances, these sounds are usually still limited to the environment of a following [u].
There is also a very rare voiceless alveolar bilabially trilled affricate, [t̪͡ʙ̥] (occasionally written "tp") reported from a few words in the Chapacuran languages, Wari’ and Oro Win. The sound also appears as an allophone of the labialized voiceless alveolar plosive/tʷ/ of Abkhaz and Ubykh, but in those languages it is more often realised by a doubly articulated stop [t͡p]. In the Chapacuran languages, [tʙ̥] is reported almost exclusively before rounded vowels such as [o] and [y].
Its manner of articulation is trill, which means it is produced by vibrations of the articulators. In most instances, it is only found as the trilled release of a prenasalized stop.
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Where symbols appear in pairs, the one to the right represents a voiced consonant. Shaded areas denote pulmonic articulations judged impossible.
