hairpins

/HH EH1 R P IH0 N Z/
noun
  1. 1

    A pin or fastener for the hair.

  2. 2

    A kind of ribozyme; hairpin ribozyme.

  3. 3

    A very tight bend in a road.

  4. 4

    An elongated v-shaped sign placed underneath a staff to indicate a crescendo

Source: https://en.wiktionary.org/wiki/hairpin, https://en.wiktionary.org/wiki/hairpins