The yoroi-dōshi (鎧通し), "armor piercer" or "mail piercer", is one of the traditionally made Japanese swords (nihontō) that were worn by the samurai class...

tapers to a point and contains a shinogi that runs to the point. Yoroi tōshi (鎧通し, or yoroi dōshi): tantō that have particularly thick cross-sections for armor-piercing...

marks off the kissaki from the rest of the blade. (see image) yoroi tōshi (鎧通し, lit. straight through armour) – dagger used for cutting through armour....