Hasp
It's called a hasp. ------------------------------ a bolt a catch a latch a lock
The trap is "sprung" when it's been set off by an animal.The animal "springs" the trap.It is the same when you "spring" a different kind of trap on a fellow human being.
Extinct Relict
epiglottis
A high pinch point area exists (suicide) between two open doors on the same side.