Key

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Key may refer to:

Common meanings [edit]

Key (lock), device used to open a lock such as in a door
Key, a guide to colours and symbols used in a data chart, graph, plot or diagram. See Chart
Key (cryptography), a piece of information that controls the operation of a cryptography algorithm
Key (engineering), a type of coupling used to transmit rotation between a shaft and an attached item
Cay, also spelled key, a small, low-elevation, sandy island formed on the surface of a coral reef
Key (map), a guide to a map's symbology

Identification key, a method of deducing the correct species assignment of a living thing
Single-access key, a method used for categorizing species using logical choices

Key Island, Tasmania, Australia
Florida Keys, an archipelago of about 1700 such islands in the southeast United States
Key, West Virginia
Keys, Oklahoma

Key (music), the tonic chord of a piece of music
- Key signature, an indication of the key in musical notation
Key (instrument), part of a musical instrument used for playing or tuning
Keys, short for keyboard instruments
Key (singer) (born 1991), South Korean entertainer
Key (album), a 2004 album by Son, Ambulance

Key (company), a Japanese visual novel studio
KeyBank, a bank headquartered in the Key Tower in Cleveland, Ohio
Key Club, a worldwide student service organization
House of Keys, the directly elected lower branch of Tynwald, the parliament of the Isle of Man

Key color (typically black), in the CMYK color model
Key plate, a plate which prints the detail in an image, often using the color black
Chroma key, a method to superimpose several video layers using areas of a defined color as a mask

Key (basketball), a restricted area around the basketball net
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
Keys, a truce term used in western Scotland
Samara (fruit) or key, a type of fruit in which a flattened wing of fibrous, papery tissue develops from the ovary wall
Telegraph key, the button used by a telegraph operator