A night latch (or night-latch or nightlatch) is a door lock having a sprung bolt that is operated from the exterior side of the door by a key and from the interior (i.e. "secure") side of the door by a knob.
Historically, such locks were intended for use at night-time, hence the name. The keyless egress that they offer is a valuable fire safety measure.
- "Definition of NIGHT LATCH". www.merriam-webster.com.
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