You've never seen my avatar? You would know this answer if you saw my avatar i've had since I was a BS member.
But yes it is the Japanese sword and it is the only known sword to cut a man through his torso with one slice and could repeatedly do that several times before having to be sharpened. And it is the only sword to have a temper line on the edge of the blade tempered with clay. It is also the only sword that is folded and beated over a thousand times during the blades construction. One of the finest blades in the world as far as im concerned.