Reticle

n. network of fine wires in the focus of the eyepiece of a telescope

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, and are also popular in graphical user interfaces as a precision pointer. The crosshair was invented by Robert Hooke, and dates to the 17th century.
See more at Wikipedia.org...

Noun
1. a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument
(synonym) reticule, graticule
(hypernym) network
(part-holonym) eyepiece, ocular
(part-meronym) cross hair, cross wire

(n.)
A small net.
  

(n.)
A reticule. See Reticule, 2.
  

a glass plate that contains a pattern of transparent and opaque areas. A reticle contains the pattern for one or more die but is not large enough to transfer a wafer sized pattern all at once.