According to the rules of Taiho Ritsuryo (Taiho Code) enacted in 701, there were 4 different types of kanin which were called Naiin, Gein, Shoshiin, and Syokokuin.
大宝律令（701年）の規定によれば、官印には、内印、外印、諸司印および諸国印の4種があった。