ɓ Bilabial

/ɓ/ Voiced bilabial implosive (Hooktop B)

Instructions:

Articulator: Lower lip
Point of Articulation: Upper lip
Manner: Implosive – 1) Make a closure between the articulator and the point of articulation. 2) While your glottis is vibrating (i.e., voicing is occurring), move your larynx down. 3) Release the closure made in 1), which will allow air to flow into your mouth.
Voice: Voiced

Occurrence:
Ega, Fula, Goemai, Hausa, Jamaican Patois, Kalabari, Khmer, Mono, Seereer-Siin, Sindhi, Tera, Tukang Besi, Vietnamese, Zulu
(Source: https://en.wikipedia.org/wiki/Voiced_bilabial_implosive#Occurrence)