A hyperbolic version of the Euclidean Cube.
See also Hyperbolic Dodecahedron, Hyperbolic Octahedron, Hyperbolic Tetrahedron
References
Rivin, I. ``Hyperbolic Polyhedron Graphics.''
http://www.mathsource.com/cgi-bin/MathSource/Applications/Graphics/3D/0201-788.