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Key may refer to:

Common meanings[edit]

  • Key (cryptography), a piece of information that controls the operation of a cryptography algorithm
  • Key (lock), a device used to open a lock such as in a door, safe, or other openings to objects or places
  • Key (map), a guide to a map's symbology
  • Key, on a typewriter or computer keyboard
  • Answer key, a list of answers to a test
  • A way of doing something. (The key of skateboarding is...)


  • Cay, also spelled key, a small, low-elevation, sandy island formed on the surface of a coral reef

United States[edit]


Arts, entertainment, and media[edit]


Musical instruments[edit]


Other uses in arts, entertainment, and media[edit]




  • Key (engineering), a type of coupling used to transmit rotation between a shaft and an attached item
  • KeY, a software verification tool
  • .key, file extension used by Keynote
  • Telegraph key, the button used by a telegraph operator

Other uses[edit]

  • Key (company), a Japanese visual novel studio
  • Keys, a truce term used in western Scotland
  • Amazon Key, a service by Amazon allowing customers to get deliveries inside of their home or car
  • House of Keys, the directly elected lower branch of Tynwald, the parliament of the Isle of Man
  • Samara (fruit) or key, a type of fruit

See also[edit]