A triangular lattice is a two-dimensional point lattice generated by two vectors of equal length meeting at an angle of 
. It is the root lattice 
up to scale and rotation, and is the
set of vertices of a triangular grid. Its Voronoi
cells are regular hexagons, so the same point
lattice is sometimes called a hexagonal lattice
in packing contexts.
Triangular Lattice
See also
Hexagonal Grid, Hexagonal Lattice, Point Lattice, Root Lattice, Triangular GridExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Triangular Lattice." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/TriangularLattice.html