# Space lattice

A structure of crossed wooden or metal strips usu. arranged to form a diagonal pattern of open spaces between thestrips. a lattice is a set of points, regularly arranged in space, for which the environment of each point is identical. A 3-D lattice is described by adding a third unit vector, c, to the unit vectors, a and b, which define the unit cell of the 2-D lattice. This is shown here for a small portion of a 3-D lattice. The unit cell of a 3-D lattice takes the general shape of a parallelepiped.