In Zen Buddhism, the keisaku (Japanese: 警策, Chinese: 香板, xiāng bǎn; kyōsaku in the Soto school) is a flat wooden stick or slat used during periods of meditation to remedy sleepiness or lapses of concentration.
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In Rinzai Zen, the stick is requested in the same manner, but may also be used at the discretion of the Ino, the one in charge of the meditation hall.