What does reticle mean?
A reticle is a small pattern of crossed or otherwise arranged lines, hairs, or wires viewed through an optical instrument. By providing a fixed reference point, it allows an observer to align a telescope or microscope, aim a rifle or other sighting device, and perform precise measurements. The word is chiefly technical: in astronomy, surveying, engineering, and weapons, a reticle may resemble crossed hairs, a graduated scale, or a more elaborate targeting pattern. Although the feature can appear visually simple, its dimensions and calibration are often crucial because errors at the instrument's focal plane are magnified when the target is viewed. The term is also occasionally used more broadly for a reticular overlay or grid, but its established meaning concerns the reference markings inside optical equipment.
nounA reticle is a small arrangement of fine lines, hairs, or wires placed in the focal plane of an optical instrument to aid alignment, measurement, or aiming.
- A system of fine lines, hairs, or wires within an optical instrument, used to locate, align, or measure an object.
"She adjusted the rifle's reticle until the target was centered in the scope."
"The astronomer's faint observation was centered within the telescope's reticle."
"The technician used a reticle alignment tool to calibrate the microscope."
The plural is formed by adding -s.
"The technician replaced the cracked reticles in both microscopes."
A reticle is a tiny grid in plain sight—the mark that lets a precise instrument turn a distant view into a measurable target.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does reticle come from?
The word entered English from French réticule, a diminutive of Latin reticulum, meaning “little net.” The Latin root in turn derives from rete, “net.” Reticules were originally fine netlike arrangements placed in telescopes; over time, the word came to refer broadly to the lines or markings used as sighting and measuring references.
How reticle is actually used
The term is primarily technical and is most often used with optical or targeting instruments. In modern usage it generally refers to the line pattern rather than to the entire sighting device.