The Bilabial trill reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Bilabial trill

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, and the equivalent X-SAMPA symbol is B\\.

IPA - Unicode	ʙ
IPA - image
X-SAMPA	B\\
Kirshenbaum	b

Features of this consonant:

• Its manner of articulation is trill, which means it is produced by vibrations of the articulators.
• Its place of articulation is bilabial which means it is articulated with both lips,
• Its phonation type is voiced, which means the vocal cords are vibrating during the articulation.
• It is an oral consonant, which means air is allowed to escape through the mouth.
• It is a central consonant, which means it is produced by allowing the airstream to flow over the center of the tongue, rather than the sides.
• The airstream mechanism is pulmonic egressive, which means it is articulated by pushing air out of the lungs and through the vocal tract, rather than from the glottis or the mouth.

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