Eunjangdo is a type of silver knife or norigae historically worn in Korea.
In the Joseon Dynasty period, both Korean men and women generally wore jangdo.
In the period of Hyunjong (1670), there was a law that would penalize common people for use of eunjangdos.
In a feudal society, gold and silver were indicators of social hierarchy.
[2] The eunjangdo appears in the second episode of Cobra Kai season 6 "The Prize" as an ancient family knife John Kreese recovers for his master.