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Key may refer to:
- 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
- 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
- Samara (fruit) or key, a type of fruit in which a flattened wing of fibrous, papery tissue develops from the ovary wall, often called "helicopters"
Companies and organizations
- 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
- Computer keyboard keys
- KeY, a software verification tool
- Key, a data element which allows one to find associated data using a database index or a hash table
- .key, file extension used by Keynote (presentation software)
- Key English Test, an international examination of basic level of English language.
- Key (comics), a DC Comics supervillain
- Key (Marvel Comics), a fictional mutant character
- Key the Metal Idol, Japanese anime OVA series
- Kirby's Epic Yarn (KEY), a 2010 game by Nintendo
- "The Keys" (Seinfeld), a 1992 TV episode
- Key, Iran, a village in Isfahan Province, Iran
- 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 (Son, Ambulance album), 2004
- Key (Meredith Monk album), 1971
- 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 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
- The primary tone of an image, as in high key or low key images
- Key (basketball), a restricted area around the basketball net
- Telegraph key, the button used by a telegraph operator
- Frederick Keys, a Double-A minor league baseball team.
- Keys, a truce term used in western Scotland
- All pages beginning with "Key"
- All pages with titles containing "Key"
- The Key (disambiguation)
- The Keys (disambiguation)
- Keying (disambiguation)
- Keyes (disambiguation)
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