Ji and chāi are generic terms for hairpin in China. Ji is also the term used for hairpins of the Qin dynasty. The earliest form of Chinese hair stick was found in the Neolithic Hemudu culture relics;
Two styles of Chinese hairpin, zan and chai.
Silver hairpins, Tang dynasty
Shang dynasty bone hairpin
A hairpin or hair pin is a long device used to hold a person's hair in place. It may be used simply to secure long hair out of the way for convenience or as part of an elaborate hairstyle or coiffure.
A modern hair pin, typically used for formal styling such as updos and buns
A golden double-spiral-headed pin from Georgia (3rd millennium BC)
Gold phoenix hairpin found in the Ming dynasty tomb of Prince Chuang of Liang (梁莊王, 1411–1441), 15th century.