In Zen Buddhism, the keisaku (Japanese: 警策, Chinese: 香板, xiāng bǎn; also called kyōsaku) is a flat wooden stick or slat used during periods of meditation to remedy sleepiness or lapses of concentration. This is accomplished through a strike or series of strikes, usually administered on the meditator's back and shoulders in the muscular area between the shoulder and the spine. The keisaku itself is thin and somewhat flexible; strikes with it, though they may cause momentary sting if performed vigorously, are not injurious. Taku are wooden clappers or sounding sticks. They are used in the zendo.