A kind of ribozyme; hairpin ribozyme.
A pin or fastener for the hair.
A very tight bend in a road; a hairpin bend.
An elongated horizontal v-shaped sign placed underneath a staff to indicate a crescendo or decrescendo.
The incurved rim of the external ear.
A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
A small volute under the abacus of a Corinthian capital.
An upside down midair 360° spin in playboating.
To form or cause to form a helix.