Crosshair
From Free net encyclopedia
A crosshair or reticle is a shape superimposed on an image that is used for precise alignment of a device. Crosshairs are most commonly a "+" shape, though many variations exist, including dots, posts, circles, and chevrons. Most commonly associated with telescopic sights for aiming firearms, crosshairs are also common in optical instruments used for astronomy and surveying. The crosshair was invented by Robert Hooke, and dates to the 17th century.
Crosshairs are also a very common subject on computer games, typically first-person shooters. Most of these games implement some form of crosshair so that players can aim accurately. Versions of popular games with no crosshairs exist, usually as a more challenging game mode - Quake 2 Iron Sights, for example.