Setar (Persian: سهتار, from seh, meaning "three" and tār, meaning "string") is a Persian musical instrument used across Greater Iran and Central asia. It is a member of the lute family, which is played with index finger of the right hand. Two and a half centuries ago, a fourth string was added to the setar. it has 25 - 27 moveable frets which are usually made of animal intestines or silk. It originated in Persia before the spread of Islam.
The satar (Uyghur: ساتار; Chinese: 萨塔尔) is an important instrument in 12 muqam. It is a bowed lute with 13 strings, one raised bowing string and 12 sympathetic strings, tuned to the mode of the muqam or piece being played.