Among Buddhists the term means the practice of the 六度 sixpāramitās; it is referred, among outsiders, to the six austerities of the six kinds of heretics: (1) 自餓 starvation; (2) 投淵 naked cave-dwelling (or, throwing oneself down precipices); (3) 赴火 self-immolation, or self-torturing by fire; (4) 自坐 sitting naked in public; (5) 寂默 dwelling in silence among graves; (6) 牛狗 living as animals.