(mathematics) The n⨯n symmetric matrix with entries m_ij, which can be conveniently encoded by a Coxeter diagram.

(graph theory) A 3-regular graph with 28 vertices and 42 edges, one of the 13 known cubic distance-regular graphs.

plural of Coxeter graph

(geometry) A linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices.