符是古代方术中使用的一种重要法物,据云可以代表天神的庇护,驱劾鬼魅,消灾除病,具有无上的威力。《后汉书·费长房传》云:翁又为作一符,曰:以此主地上鬼神,……遂能医疗众病,鞭答百鬼,及驱使社公。或在宅坐,独自恚怒,人问其故,曰:吾责鬼魅之犯法者耳。……后 Fu symbol is an important method used in ancient alchemy, according to the cloud can represent the shelter of the gods, exorcism ghosts, eliminate disasters and remove diseases, with supreme power. “Later Han Fei fee room Biography”: Weng and make a symbol, saying: In this main ghosts and gods, ... ... then can cure all diseases, whip a hundred ghosts, and to drive social public. Or sit in the house, alone sulking, people ask its sake, saying: I responsible for the ghost of the criminal law ear. ……Rear