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Grating
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Look up <i>grating</i> in Wiktionary, the free dictionary. <p>A grating is any regularly spaced collection of essentially identical, <a href="/facts/Parallel_(geometry)/16r5yq7D">parallel</a>, 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 <a href="/facts/Perpendicular/u0k8xqx4">perpendicular</a> to the first (as illustrated). When the two sets are perpendicular, this is also known as a grid (as in <a href="/facts/Grid_paper/NKJBaxCS">grid paper</a>) or a <a href="/facts/Mesh/NEhkQbRx">mesh</a>. </p>