Octahedron

In geometry, an octahedron (pl.: octahedra or octahedrons) is any polyhedron with eight faces. One special case is the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. Many types of irregular octahedra also exist, including both convex and non-convex shapes.

Regular octahedron

Main article: Regular octahedron

A regular octahedron

The regular octahedron has eight equilateral triangle sides, six vertices at which four sides meet, and twelve edges. Its dual polyhedron is a cube.[1] It can be formed as the convex hull of the six axis-parallel unit vectors in three-dimensional Euclidean space. It is one of the five Platonic solids,[2] and the three-dimensional case of an infinite family of regular polytopes, the cross polytopes. Although it does not tile space by itself, it can tile space together with the regular tetrahedron to form the tetrahedral-octahedral honeycomb.

Octahedron - Wikipedia 

gmtrx octahedron

gmtrx skeletal octahedron

gmtrx octahedron 45 mm icosahedron 1.5 mm shell

gmtrx octahedron

gmtrx octahedron

gmtrx octahedron

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