Keyhole

A keyhole is where a key is inserted to open a lock. It is more properly known as a keyway.

Keyhole has the following meanings: Gravitational keyhole is a region of an orbit where a small gravitational input could cause a small body to collide with the large body it is orbiting.
Keyhole surgery is another name for Laparoscopic surgery
Keyhole, Inc. was a company acquired by Google
Keyhole, an alternative comic published in the 1990s.
Key Hole (KH) series of imaging satellites used by various United States agencies.
Keyhole cichlid, a fish from the genus Cleithracara
Keyhole button closure, is a single button, usually found on the back of a woman's blouse, that when buttoned, exposes a small hole
Keyhole Falls, a waterfall in British Columbia, Canada
Keyhole Glacier, a glacier on Baffin Island, Nunavut, Canada
Keyhole nebula, another name for the Carina Nebula