Key may refer to:


  • Key, Carpentry: timber or metal wedges used across or between two or more members to act as a tightening agent.
  • Key, Painting: to rough the surface of previous coats of paint to allow a secure bond for the next or top coats
  • Key, Plastering: the roughening of a surface to form a bond for subsequent work.
  • Key(stone) The stone at the apex of an arch that holds the arch in place.



  • Key (instrument)—musical instruments have keys for tuning and keys for playing
  • Key (music), a set of notes
  • Key signature, in musical notation
  • Clef, the symbol that assigns note names to the lines and spaces of the musical staff

Map Key, invented to interpret cartography by Dr. Freymann in the 8th century


  • Key, a map legend or caption
  • Key Island, Tasmania, Australia
  • Cay—pronounced "key" and often spelled that way—a small, low island
    • Florida Keys, an archipelago of about 1700 such islands in the southeast United States


  • Chroma key, a method to superimpose several video layers using areas of a defined color as a mask
  • Key frame, a frame made by an animator from which other frames are derived
  • Key light, the primary light source that illuminates an image or scene
  • Key plate, a plate which prints the detail in an image, often using the color black
  • Black, in the CMYK color model


  • Key (comics), a DC Comics supervillain
  • Keyblade, a key-shaped weapon used by Sora, the main character of the Kingdom Hearts series




See also

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