Eo

Eo is a wooden percussion instrument shaped like a tiger.
It was introduced from China during thd reign of King Yejong of Goryeo dynasty. Today, it is used in the ritual music performed at Confucian shrines to signal the end of a concert.
It is always placed on the west side of any musical ensemble.
There are 27 saw teenth on the back, which are scraped with a bamboo rod once; the head of the tiger is struck with a hammer three times to signal the end of a piece.