Other
- Churchkey, various kinds of bottle and can openers
- Clef (from the French for "key"), the symbol that assigns note names to the lines and spaces of the musical staff
- Greek key pattern, a meander pattern
- Key (basketball), also known as the shaded lane in a basketball court
- Keychain, small chain that connects a small item to a keyring
- 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
- Keystone (architecture), the stone at the apex of an arch that holds the arch in place
- Samara (fruit) or key, a type of fruit in which a flattened wing of fibrous, papery tissue develops from the ovary wall
- Subkey (disambiguation)
- Telegraph key, the button used by a telegraph operator
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