Not to be mixed with the butterfly knife, a butterfly sword is a broad, rougly fore-arm length, single-edged sword, often wielded in pairs. Also has a crossguard to protect the hands, and some "hooks" which can be used to stop or disarm an enemy. Often carried in one scabbard, to hide the fact that you have two of them.
I really want to learn how to use butterfly swords, just like Kano!
