红巾 literally means 'red scarf'—a compound noun formed by 红 (hóng, 'red') and 巾 (jīn, 'scarf' or 'cloth'). While it can refer to any red scarf in a general sense, it most commonly denotes the red neckerchief worn by members of the Young Pioneers, a youth organization for elementary school students in China. This symbolic garment represents revolutionary spirit and is part of the official uniform.

In everyday speech, 红巾 is less frequently used for ordinary fashion scarves; instead, people usually say 围巾 (wéijīn, 'scarf') or 红色围巾 (hóngsè wéijīn, 'red scarf'). The term carries cultural and institutional connotations, especially tied to school life and patriotic education. It may also appear in historical contexts referring to red-clothed rebel groups (e.g., Red Turban rebels), but that usage is rare today and mostly found in textbooks or historical narratives.