graticule(n = noun.artifact) reticle, reticule - a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument;
is a kind of network
is a part of eyepiece, ocular
has parts: cross hair, cross wire

   A design or draught which has been divided into squares, in order to reproduce it in other dimensions. [1913 Webster]

graticule, n.
1 fine lines or fibres incorporated in a telescope or other optical instrument as a measuring scale or as an aid in locating objects.
2 Surveying a network of lines on paper representing meridians and parallels.

Etymology:
F f. med.L graticula for craticula gridiron f. L cratis hurdle