Key

Key may refer to: Key (lock), device used to open a lock
Key (cryptography), a piece of information that controls the operation of a cryptogaphy algorithm

Music

Key (instrument), musical instruments have keys for tuning and keys for playing
Key (music), a set of notes
Key (Son, Ambulance album)
Key signature, in musical notation

Computing

Computer keyboard keys
KeY, a software verification tool
Unique key, a set of fields that uniquely identify any record in a database
Superkey, a similar concept
Candidate key, a minimal superkey
Key (database), a set of database columns used in an index
Key, which make up the key-value pairs of a hash table

Fiction

The Key (novel), a novel in Marianne Curley's Guardians of Time trilogy
Key (comics), a DC Comics supervillain
Key (Marvel Comics), a fictional mutant character
Key the Metal Idol, Japanese anime OVA series

Surnames

Key (surname)
Keys (surname)
Keyes

Geography

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

Other uses

Key or legend, a explanation of the symbols and colours used in a diagram
Key (map), a guide to a map's symbology
Key (chart), a guide to colours and symbols used in a data chart, graph, plot or diagram
Key (basketball), also known as the shaded lane in a basketball court
Key (company), a Japanese visual novel studio
Key (engineering), a piece of metal made to be placed in a Keyway (engineering)
Key (singer), a member of the band Shinee
Keying (graphics), compositing image components, such as by using chroma keying
Keying (vandalism), a type of vandalism involving paint scratching
Keystone (architecture), the stone at the apex of an arch that holds the arch in place
Key Bank, a bank headquartered in the Key Tower in Cleveland, Ohio
Key Club, a worldwide student service organization
Samara (fruit) or key, a type of fruit in which a flattened wing of fibrous, papery tissue develops from the ovary wall
House of Keys, the directly elected lower branch of Tynwald, the parliament of the Isle of Man

Translation

The word "Key" occurs as such in the following languages: English, Chinese.

Translation(s) in other languages: Arabic: مفتاح (توضيح), Aragonese: Clau, Bulgarian: Ключ, Catalan: Clau, German: Schlüssel (Begriffsklärung), Greek: Κλειδί, Spanish: Clave, Persian: کلید (ابهام‌زدایی), French: Clé, Italian: Chiave, Hebrew: מפתח, Kazakh: Кілт, Lithuanian: Raktas (reikšmės), Macedonian: Клуч, Dutch: Sleutel, Japanese: キー, Norwegian (Bokmål): Nøkkel (andre betydninger), Norman: Cllé, Polish: Klucz, Portuguese: Chave (desambiguação), Romanian: Cheie (dezambiguizare), Russian: Ключ, Serbian: Кључ, Finnish: Avain (täsmennyssivu), Swedish: Nyckel (olika betydelser), Thai: คีย์.