What is "sanxian"

The sanxian (, literally "three strings") is a Chinese lute — a three-stringed fretless plucked musical instrument. It has a long fingerboard, and the body is traditionally made from snake skin stretched over a rounded rectangular resonator. It is made in several sizes for different purposes and in the late 20th century a four-stringed version was also developed. The northern sanxian is generally larger, at about 122 cm in length, while southern versions of the instrument are usually about 95 cm in length.