Nightlatch
The Guild of Architectural Ironmongers publication Glossary of architectural hardware terms defines a nightlatch as a '...normally rim-style (i.e. surface mounted) and has a bevelled spring-loaded latch bolt which secures the door closed. Usually operated by a key from the outside, and knob on the inside. There is often a snib which can hold back the latch. It should be noted that there are also variants of mortice nightlatch on the market.'
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