keyhole
A keyhole is the opening or cavity of a mechanical lock , in or through which you have to insert the associated key in order to unlock it.
In common parlance, the word keyhole usually refers to a door lock . Especially with older models of internal apartment doors, cellar doors or wooden sheds, due to the simply built lock, the key openings are usually large enough and continuous to look through, which is why the keyhole is often used metaphorically to express that someone is looking at forbidden or at least questionable information Paths procured ( look through the keyhole ; he gets his information through keyholes ).
Vignetting the image with the contour of a keyhole in film or photography has been a stylistic device since the silent film era to suggest a secret, hidden or forbidden gaze.
A keyhole is less often used to illustrate the tiny size of an object: it fits through the keyhole .
A number of optical spy satellites were built under the English name of Keyhole .
A particular form of Japanese barrows is called "keyhole tombs " because the shape of these tombs, when viewed from above, resembles the frontal view of a simple keyhole. This type of grave can also be found in North Africa (Tadrat), and trenches in this form can also be found under burial mounds of the late Neolithic in northern Germany.
As a keyhole one is also referred that with sufficient space-time accuracy that must be passed gate, interplanetary traveling spacecraft to the following needs to happen swing-by to be able to successfully complete maneuver.
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- ↑ ESA: Raumfahrt: Back to Routine orf.at, April 8, 2020, accessed April 8, 2020.