About
The character 鞲 (gōu) is a phono-semantic compound originally meaning an archer’s or falconer’s leather armguard. Its structure combines the semantic radical 革 (gé), meaning “leather,” indicating the material, with the phonetic component 冓 (gōu), providing the pronunciation. Over time, its meaning broadened to include mechanical components with a similar sleeve-like or tight-fitting function, such as pistons or packing rings in pumps and engines. This evolution from traditional protective gear to a modern engineering term reflects how the core concept of a fitted sleeve determines its application.