Signature refers to the general name of signature and seal. That is, the name of the party or the name of the unit is stamped. Its function means double insurance. The concept of signature and seal was adopted in May 2005 1995 at the 13th meeting of the Eighth NPC Standing Committee. The contents involved in this meeting are as follows: Article 7 The signature on a negotiable instrument means signature, seal or both. The signature of the legal person or other organization that uses the bill shall be the signature of the legal person or other organization plus the signature of its legal representative or its authorized agent. The signature on a bill of exchange shall be the real name of the party concerned. According to the nature of signature, it can be divided into legal person seal and natural person seal.