WLattice (group)
WBragg plane
WDiamond cubic
WDivisor summatory function
WEisenstein integer
WEuclid's orchard
WFokker periodicity block
WFundamental pair of periods
WGaussian integer
WHexagonal lattice
WInteger points in convex polyhedra
WLattice reduction
WNo-three-in-line problem
WPick's theorem
WReciprocal lattice
WReeve tetrahedron
WRegular grid
WSquare lattice