Reticle

Common card · No. 243887

A reticle or reticule, also known as a graticule, is a pattern of fine lines or markings built into the optical path of an optical device to provide measurement references during visual inspections. Reticles are usually built into the eyepiece of spotting scopes, theodolites or optical microscopes, allowing different reticles to be interchanged when changing the eyepiece, although reticles in telescopic sights or the screen of an oscilloscope are permanently fixed in place. Today, engraved lines or embedded fibers may be replaced by a digital image superimposed on a screen or eyepiece. Both the terms "reticle" and "graticule" may be used to describe any set of patterns used for aiding visual measurements and calibrations, but in modern usage reticle is most commonly used for weapon sights, while graticule is more widely used for non-weapon measuring instruments such as oscilloscope display, astronomic telescopes, microscopes and slides, surveying instruments and other similar devices. There...

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