In phonetics and phonology, a bilabial stop is a type of consonantal sound, made with both lips (hence bilabial), held tightly enough to block the passage of air (hence a stop consonant). The most common sounds are the stops [p] and [b], as in English pit and bit, and the voiced nasal [m]. More generally, several kinds are distinguished: * [p], voiceless bilabial stop * [b], voiced bilabial stop * [m], voiced bilabial nasal * [m̥], voiceless bilabial nasal * [ɓ], voiced bilabial implosive * [pʼ], bilabial ejective (rare) * [ɓ̥] or [pʼ↓], voiceless bilabial implosive (very rare)