Keep
The Guild of Architectural Ironmongers publication Glossary of architectural hardware terms defines a keep as an 'alternative word for a staple or strike plate i.e. the part of the lock which receives the bolt and secures the door.'
A strike plate is defined in the same document as 'a flat metal plate fixed to the door frame into which the bolt or bolts shoot. There is a shaped or bevelled lip on one side to guide the latchbolt. A strike plate is always provided with a mortice lock or latch, and with rim locks on an outward opening door.'
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