The voiceless 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 ⟨ʙ̥⟩. The X-SAMPA symbol is B\_0
This sound is typologically extremely rare. It occurs in languages such as Pará Arára[1] and Sercquiais.[citation needed]
Only a few languages contrast voiced and voiceless bilabial trills phonemically – e.g. Mangbetu of Congo and Ninde of Vanuatu.[2][3]
There is also a very rare voiceless alveolar bilabially trilled affricate, [t̪͡ʙ̥] (written ⟨tᵖ̃⟩ in Everett & Kern) reported from Pirahã and from a few words in the Chapacuran languages Wariʼ and Oro Win. The sound also appears as an allophone of the labialized voiceless alveolar stop /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].
Additionally, Lese has another rare trilled affricate, a labial–velar trilled affricate [k͡pʙ̥], which occurs as an allophone of the voiceless labial–velar plosive [k͡p].[4]
^de Souza, Isaac Costa (2010). "3". A Phonological Description of "Pet Talk" in Arara (MA). University of North Dakota. S2CID 61247622.
^Linguist Wins Symbolic Victory for 'Labiodental Flap'. NPR (2005-12-17). Retrieved on 2010-12-08.
^LINGUIST List 8.45: Bilabial trill. Linguistlist.org. Retrieved on 2010-12-08.
^Cite error: The named reference :0 was invoked but never defined (see the help page).
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