A keyhole (or keyway) is a hole or aperture (as in a door or lock) for receiving a key. Lock keyway shapes vary widely with lock manufacturer, and many manufacturers have a number of unique profiles requiring a specifically milled key blank to engage the lock's tumblers.
Through the Keyhole is a British comedy panel game show created by TV Producer Kevin Sim and originally presented by Sir David Frost and Loyd Grossman. It features the host going around celebrities' houses and then getting a panel of other celebrities to try to guess who the famous homeowner is.
Keyhole Kate was a 1930s British comic strip series in The Dandy. The strip featured a nosy young girl who liked to look through people's keyholes. She first appeared in The Dandy's first issue, drawn by Allan Morley back in 1937. She continued in The Dandy until 1955 and even appeared as the cover strip of issue 294. She later appeared in the new Sparky comic released in 1965, alongside Hungry Horace another character who appeared in The Dandy''s first issue and was drawn by Allan Morley. The character was featured alongside Hungry Horace on the front cover of the Sparky book from 1970 to 1972.
A gravitational keyhole is a tiny region of space where a planet's gravity would alter the orbit of a passing asteroid such that the asteroid would collide with that planet on a given future orbital pass. The word "keyhole" contrasts the large uncertainty of trajectory calculations (between the time of the observations of the asteroid and the first encounter with the planet) with the relatively narrow bundle(s) of critical trajectories. The term was coined by P. W. Chodas in 1999. It gained some public interest when it became clear, in January 2005, that the Asteroid 99942 Apophis would miss the Earth in 2029 but may go through one or another keyhole leading to impacts in 2036 or 2037. Further research has since been done, however, which revealed the probability of Apophis passing through the keyhole was extremely insignificant.
Keyhole was a black-and-white alternative comic book published from 1996–1998. A two-man anthology by cartoonists Dean Haspiel and Josh Neufeld, Keyhole was published by two different publishers, starting with Millennium Publications and ending up at Top Shelf Productions.
Keyhole limpet hemocyanin (KLH) is a large, multisubunit, oxygen-carrying, metalloprotein that is found in the hemolymph of the giant keyhole limpet, Megathura crenulata, a species of keyhole limpet that lives off the coast of California, from Monterey Bay to Isla Asuncion off Baja California.
Operation Keyhole was a British special operation to recapture Thule Island in the South Sandwich Islands during Operation Corporate in the 1982 Falklands War. The operation took place from 19 to 20 June 1982.
A keyhole race is a speed event commonly seen at equestrian events and gymkhanas, in which the horse and rider team with the fastest time in completing the event wins. Horses running this event must have speed, but also the agility to stop quickly in full stride, turn, and bolt directly back into a run.