250px|thumb|Gassan school yoroi-doshi tanto. Signed "Yoshiteru", c. 1865, motogasane, (blade thickness) at the hamachi (the notch at the beginning of the cutting edge), nagasa (cutting edge), "ayasugi hada” which looks like a series of undulating rolling waves.
250px|thumb|Gassan school yoroi-doshi tanto. Signed "Yoshiteru", c. 1865, motogasane, (blade thickness) at the hamachi (the notch at the beginning of the cutting edge), nagasa (cutting edge), "ayasugi hada” which looks like a series of undulating rolling waves.
The , "armor piercer" or "mail piercer", is one of the traditionally made Japanese swords (nihontō) that were worn by the samurai class as a weapon in feudal Japan.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).