Azusa Yumi

An azusa yumi is a sacred bow used in certain Shinto rituals in Japan, as well as a Japanese musical bow, made from the wood of the Japanese azusa or Japanese cherry birch tree. Playing an azusa yumi forms part of some Shinto rituals; in Japan, it is believed that merely the twanging of the bowstring will frighten ghosts and evil spirits away from a house. In Japanese poetry, the word azusa yumi functions as a makurakotoba.
The story is told in Japanese mythology that a golden bird perched on the bow of Emperor Jimmu, the great-grandson of the sun goddess Amaterasu, and the first human ruler of Japan. This was seen as an extremely good omen; Jimmu's bow developed the power to dispel evil by the mere plucking of its string. His bow was made of azusa wood.