Also known as the Japanese sword or samurai sword, it is a traditional Japanese single blade sword renowned for its sharp, curved blade and exquisite craftsmanship. Not only is it a symbol of the Japanese samurai class, but it is also an important part of Japanese culture. The production technology is very complex, involving forging, quenching, tempering, and fine grinding processes of the blade. The blade usually presents a unique curve, which not only increases the cutting force of the blade, but also makes it more flexible when swung. The handle design takes into account the user's grip comfort and efficiency, while the sheath is usually made of hardwood or metal, which not only protects the blade but also reflects a certain degree of decoration.