Key

The word key has several uses:

A key is a physical object used in a lock.
A key (cryptography) is a piece of information, usually kept secret, used to customise ciphers.
A key (music) is a property of a piece of music: see also key signature.
A key (instrument) is a moving part of a musical instrument.
A key (art) features in painting and photography.
Typewriter and computer keyboards contain keys.
Keying is an operation in video editing.
The Florida keys is a place in Florida.
A skate key is used for roller skates.

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