Computing
- Computer keyboard keys
- KeY, a software verification tool
- Unique key, a set of fields that uniquely identify any record in a database or registry
- Superkey, a similar concept or idea
- Candidate key, a minimal superkey
- Keychain (Mac OS), the Apple-created utility for the Macintosh that stores passwords
- Key, which make up the key-value pairs of a hash table
- .key, file extension used by Keynote
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