Shuriken
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A shuriken is a Japanese concealed weapon used by samurai or ninja or in martial arts as a hidden dagger or metsubushi to distract or misdirect.
Five types of shuriken
Edo period shuriken in Odawara Castle Museum, Japan. Note the senbon darts.
Four antique forged Japanese bo shuriken (iron throwing darts with linen flights)
Various types of shuriken at the Iga-ryū Ninja Museum