In this episode, the hidden knives that Mai throws at Katara, are known as shuriken. Shuriken were widely used by the ancient Japenese samurai in warfare, as well as by Japanese assassins. There are two major designs of shuriken, hira-shuriken and bo-shuriken. Hira-shuriken comes in a variety of forms but usually orbits around the shape of a star, while bo-shuriken has the shape of a large needle or spike. Both types were utilized by Mai.