What is Saidanmei in Japanese Katana terminology?

"""Saidanmei"" (截断銘) refers to the practice of inscribing the results of a test cut or the name of the swordsman on the tang (Nakago) of the sword. This inscription is often recorded in gold inlay (Kinzougan), but there are also instances where it is recorded in silver inlay (Ginzougan) or as a cut-in inscription (Kiritsukemei).

This practice of inscribing the results of a test cut or the name of the swordsman on the sword serves several purposes. It provides a record of the sword's performance, which can be a testament to its quality and effectiveness. It also associates the sword with a particular swordsman, which can add to its historical and cultural significance. The use of gold or silver inlay for the inscription not only ensures its durability but also enhances the aesthetic appeal of the sword."