From Online Dictionary of Crystallography
Revision as of 18:43, 30 October 2008 by MassimoNespolo
In a two-dimensional pattern possessing rotational symmetry, the rotation points constitute the nodes of a net and divide the plane into regions that are called meshes. The number of meshes meeting at any rotation point equals twice the order of the rotation at that point.
N.B. The term mesh is sometimes improperly used to indicate a two-dimensional cell.