Hairpin

Hairpin can mean:

• Hairpin (fashion), a long device used to hold a person's hair in place
• Hairpin turn, tight turns on a road
• Hairpin cotter, a formed wire fastener most commonly used in clevis pins
• Hairpin clip, a formed wire fastener designed for use in grooved shafts
• A stem-loop in biochemistry
• β-Hairpin, a secondary structure motif of proteins
• Hairpins (film), a 1920 film directed by Fred Niblo
• Hairpin, in music, the nickname for crescendo and decrescendo markings. See Dynamics (music)#Gradual changes