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Saints Peter and Paul. Peter is identified by a key, Paul by a sword.

For the music term, please see key (music)

A Key is a shaped piece of metal used to lock or unlock a lock. Typically a key for one lock will not work in any other lock, but a master key will open a series of locks that also have their own individual keys.

In religious art, St Peter is often depicted holding a key, symbolising his role as the keeper of the gates of Heaven.