graticule

from WordNet (r) 3.0 (2006)

graticule
    n 1: a network of fine lines, dots, cross hairs, or wires in the
         focal plane of the eyepiece of an optical instrument [syn:
         {reticle}, {reticule}, {graticule}]

from The Collaborative International Dictionary of English v.0.48

Graticule \Grat"i*cule\, n. [F. See {Graticulation.}]
   A design or draught which has been divided into squares, in
   order to reproduce it in other dimensions.
   [1913 Webster]

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