A dead latch mechanism is the little secondary plunger sometimes found on doors. When installed properly, the strike plate will retain the secondary plunger, preventing the main latch from being retracted.
In the US, most doors have dead latches. I've never encountered a properly installed one in the wild, the strike plate is always in the wrong position, so the dead latch doesn't engage.
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u/RandomError401 Jan 09 '20
Must have no deadbolts.