Heptagonal tiling

The order-3 heptagonal tiling, or just heptagonal tiling or heat, is a regular tiling of the hyperbolic plane. 3 heptagons join at each vertex.

This tiling is the simplest tiling with three regular polygons at each vertex that neither fits in Euclidean space like the hexagonal tiling does, nor folds into spherical space like the dodecahedron (pentagons), cube (squares), or tetrahedron (triangles).