The eo (Korean: 어; Hanja: 敔) or tiger is a wooden percussion instrument carved in the shape of a tiger with a serrated back,[1] played by running a bamboo whisk across the serrations. The instrument is often played to punctuate the ends of sections of music.[2] It is derived from the Chinese yu. On the back of the tiger is a jeoeo (저어, 齟齬) that looks like 27 saws. When the music stops, the performer knocks and scratches this jeoeo through the jin (진) and gives a signal.