Tekko

The Tekkō (鉄甲, lit. "iron", "armor"), are weaponized stirrups and horseshoes which originated in Okinawa, Japan, and they fall into the category of "fist-load weapons". By definition, a fist-load weapon increases the mass of the hand so that, given the physical proportionality between the fist's momentum and its mass, it increases the force the bearer can deliver. Some fist-load weapons may also serve, in the same manner, as the guard on a sword, to protect the structure of the bearer's hand.