Shuriken on a Tatami mat
Shuriken were a traditional Japanese thrown weapon. Shuriken means "hand hidden blade." The art of using shuriken is known as shurikenjutsu. Shuriken were typically carried concealed and were used as a supplementary weapon. They could be thrown in a variety of ways to distract or injure an opponent. They were sometimes used in conjuction with poisons. Many different types of shuriken were made over time, but most were of two general shapes, shaken, sometimes called throwing stars, which are flat plates of metal, usually with a hole in the center, and bo-shuriken, which are long and shaped like a spike.
Tatami are woven mats traditionally used as a type of flooring material
in Japanese buildings. In martial arts dojos, they are used
as padding to learn breakfalls and throws.