reticle

[ret-i-kuh l] /ˈrɛt ɪ kəl/
noun, Optics.
1.
a network of fine lines, wires, or the like placed in the focus of the eyepiece of an optical instrument.
Also, reticule.
Origin
1650-60; < Latin rēticulum little net, equivalent to rēt- (stem of rēte) net + -i- -i- + -culum -cle1
British Dictionary definitions for reticle

reticle

/ˈrɛtɪkəl/
noun
1.
a network of fine lines, wires, etc, placed in the focal plane of an optical instrument to assist measurement of the size or position of objects under observation Also called graticule
Word Origin
C17: from Latin rēticulum a little net, from rēte net
Word Origin and History for reticle
n.

1650s, from Latin reticulum "little net," diminutive of rete "net" (see reticulate (adj.)).