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.
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.
Source: Wikipedia "Reticle" · CC BY-SA 4.0
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