古代射箭时戴于大拇指上的指环。多用玉或象骨制造,后作为装饰品。 《海上花列传.第二一回》:「仲英套上扳指,挂上表袋,手执折扇。」
英语 ornamental thumb ring (originally a ring, often made from jade, worn by archers in ancient times to protect the right thumb when drawing a bowstring)