Look up grating in Wiktionary, the free dictionary.
A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually perpendicular to the first (as illustrated).[1] When the two sets are perpendicular, this is also known as a grid (as in grid paper) or a mesh.
- ^ "[1] Archived 2014-07-02 at the Wayback Machine" by sanorient, The frp Demonstrations Project.