The word hairpin may refer to:
- Hairpin, A device used to fix hair into position. Hairpin can mean A long device used to hold a person's hair in place see below Hairpin bend A Stem-loop in biochemistry
- Hairpin turn, a 180-degree turn in a road. Haarspeldbochtjpg|thumb|Hairpin turn on the Mont Ventoux in France]]A hairpin turn (also hairpin bend hairpin corner etc
- Hairpin (genetics), a structure in DNA or RNA. Stem-loop intramolecular Base pairing is a pattern that can occur in single-stranded DNA or more commonly in RNA.
- β-Hairpin, a secondary structure motif of proteins
- In Dynamics (music), the symbol used to denote crescendo/decrescendo. The beta hairpin (or beta-beta unit) Structural motif is the simplest Protein motif involving two Beta strands that look like a Hairpin In Music, dynamics normally refers to the volume of a Sound or note, but can also refer to every aspect of the execution of a given piece either stylistic
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