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A kaiken is an 8–10 inch long knife, once carried by men and women of the samurai class in Japan. It was useful indoors where the long blade katana and intermediate sword wakizashi were inconvenient. Women carried them in their kimono for self-defense and for ritual suicide by slashing the veins on the left side of the neck. When a samurai woman married, she was expected to carry a kaiken with her when she moved in with her husband.
In modern Japan, a kaiken is worn as a traditional accessory for formal kimono.