Origin: Originally formed by combining 弓 (bow) to denote the physical object requiring tension, and 玄 (string/thread) to give the sound and the idea of a stretched line.

Semantic Evolution: Expanded from a literal bowstring used in hunting to musical instrument strings, and later generalized in geometry to mean a chord connecting two points on a curve, and in trigonometry to represent the hypotenuse.

• Ancient stringed instruments like the guqin used silk strings tied to wooden frames, linking music directly to the concept of the bowstring.