Literally 'black heads' —
黔 (qián, black) +
首 (shǒu, head). The Qin (
秦) commoners wore black headscarves, distinguishing them from the colored caps of officials. Qin Shi Huang officially adopted
黔首 as the term for the populace in 221 BCE per 《
史记·
秦始皇本纪》.