hexagon
24-cell: a four-dimensional figure which, like the hexagon, has orthoplex facets, is self-dual and tessellates Euclidean space
Hexagonal crystal system
Hexagonal number
Hexagonal tiling: a regular tiling of hexagons in a plane
Hexagram: six-sided star within a regular hexagon
Unicursal hexagram: single path, six-sided star, within a hexagon
Honeycomb theorem
Havannah: abstract board game played on a six-sided hexagonal grid
Central place theory
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