Keyhole

A keyhole is the cavity of a mechanical lock, in which you have to insert the appropriate key to unlock it.

In common parlance, the word keyhole relates generally to a door lock. Especially in older models of flat internal doors, cellar doors or wooden shacks the key openings are usually large enough to see behind, so the keyhole is often used metaphorically to express that someone is purchasing his information on forbidden or at least questionable ways due to the simple built castle ( look through the keyhole, he gets his information through keyholes ). Less often is with a keyhole and the smallness of certain items makes clear: The fits so through the keyhole.

Under the English name Keyhole a whole range of optical spy satellites was built.

A particular form of Japanese burial mounds called "keyhole grave " because the From these tombs viewed from above resemble the frontal view of a simple keyhole. This grave form is also found in North Africa ( Tadrat ), and ditches in this form can be found at even grave hills of the late Neolithic in northern Germany.

• Door fitting
• Locking technology