签字也称签名、押字、画押及用印等。唐以前,人们在契约、文书上只是押字,而不签名。押字者,顾名思义就是在别人代写的字上押上自己的指印。签名用印始于五代时期的后周。后周太祖郭威广顺二年(公元952年),平章李谷因生臂病辞位无法用手签名,皇帝便诏令刻印名以代之。当时做高官 Signatures also known as signature, imprisonment, painting and printing and so on. Before the Tang, people in the contract, the instrument is only a word, not a signature. The implicator, as its name implies, is to put his own fingerprints on words written by others. The signature begins with the week after the Five Dynasties. After Zhou Taizu Guo Wei Guangshun two years (AD 952), Ping Zhang Li Valley due to bibliographic resignations can not be signed by hand, the emperor then Zhao engraved name instead. At that time to be a senior official