In geometry, a 6-orthoplex, or 6-cross polytope, is a regular 6-polytope with 12 vertices, 60 edges, 160 triangle faces, 240 tetrahedron cells, 192 5-cell 4-faces, and 64 5-faces.
It has two constructed forms, the first being regular with Schläfli symbol {34,4}, and the second with alternately labeled (checkerboarded) facets, with Schläfli symbol {3,3,3,31,1} or Coxeter symbol 311.
It is a part of an infinite family of polytopes, called cross-polytopes or orthoplexes.
The rows and columns correspond to vertices, edges, faces, cells, 4-faces and 5-faces.
The diagonal numbers say how many of each element occur in the whole 6-orthoplex.
There are three Coxeter groups associated with the 6-orthoplex, one regular, dual of the hexeract with the C6 or [4,3,3,3,3] Coxeter group, and a half symmetry with two copies of 5-simplex facets, alternating, with the D6 or [33,1,1] Coxeter group.
A lowest symmetry construction is based on a dual of a 6-orthotope, called a 6-fusil.
Cartesian coordinates for the vertices of a 6-orthoplex, centered at the origin are Every vertex pair is connected by an edge, except opposites.
The 6-orthoplex can be projected down to 3-dimensions into the vertices of a regular icosahedron.
(A degenerate 4-dimensional case exists as 3-sphere tiling, a tetrahedral hosohedron.)
This polytope is one of 63 uniform 6-polytopes generated from the B6 Coxeter plane, including the regular 6-cube or 6-orthoplex.