a small slender (often pointed) piece of wood or metal used to support or fasten or attach things

a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place

formerly a long hairpin; usually with an ornamental head

A hair stick (also hairstick) is a straight, pointed device, usually between five and nine inches in length, used to hold a person's hair in place in a hair bun or similar hairstyle.