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A reticle, or reticule (from Latin reticulum, meaning 'net'), also known as a graticule (from Latin craticula, meaning 'gridiron'), is a net of fine lines or fibers in the eyepiece of a sighting device, such as a telescope, a telescopic sight, a microscope, or the screen of an oscilloscope. Today, engraved lines or embedded fibers may be replaced by a computer-generated image superimposed on a screen or eyepiece. Both terms may be used to describe any set of lines used for optical measurement, but in modern use reticle is most commonly used for gunsights and such, while graticule is more widely used for the covers of oscilloscopes and similar roles.

There are many variations of reticles; this article concerns itself mainly with a simple reticle: crosshairs. Crosshairs are most commonly represented as intersecting lines in the shape of a cross, "+", though many variations exist, including dots, posts, circles, scales, chevrons, or a combination of these. Most commonly associated with telescopic sights for aiming firearms, crosshairs are also common in optical instruments used for astronomy and surveying, and are also popular in graphical user interfaces as a precision pointer. The reticle is said to have been invented by Robert Hooke, and dates to the 17th century. Another candidate as inventor is the amateur astronomer William Gascoigne, who predated Hooke.

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    Reticle hash spacing and power?

    Was reading a review on a scope I have coming, the Sightron STAC 4-20x50 MOA. As the name would imply, this has a MOA reticle, with spacing between hash marks or 2 MOA at max power. At minimum power, that spacing is 10 MOA. But here's the real reason for this post. A statement was made in...
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