Hyperbolic Dodecahedron
A hyperbolic version of the Euclidean dodecahedron.
Hyperbolic three-space can be tessellated with hyperbolic dodecahedra whose intermediate dihedral angles are 60, 72, or 
.
A decorated hyperbolic dodecahedron has been used as the logo for Mathematica since Version 2.
Rivin, I. "Hyperbolic Polyhedra Graphics." http://library.wolfram.com/infocenter/Demos/4558/.
Trott, M. "The Cover Image: Hyperbolic Platonic Bodies." §8.3.10 in The Mathematica GuideBook for Graphics. New York: Springer-Verlag, 2004. http://www.mathematicaguidebooks.org/.
Weber, M. "Cover Art." Not. Amer. Math. Soc. 47, 340, 2000.
Weeks, J. "Curved Spaces." http://www.geometrygames.org/CurvedSpaces/.
Weisstein, Eric W. "Hyperbolic Dodecahedron." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/HyperbolicDodecahedron.html
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hyperbolic octahedron
