Gutterals, Palatals, Linguals, Dentals, Labials
Gutteral, Palatal, Lingual, Dental, Labial
He established twenty-two letters fundamentally by the voice, formed by the breath of air and fixed them on five places in the human mouth, namely:
Five, at the lips {labial sounds}, Bet, Vau, Mem, Peh.” (Sefer Yitzirah chapter two, section three.)