Great stellated dodecahedron
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In geometry, the great stellated dodecahedron is a Kepler–Poinsot polyhedron, with Schläfli symbol {5⁄2,3}. It is one of four nonconvex regular polyhedra.
Image: Great Stellated Dodecahedron
Kepler–Poinsot polyhedron
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In geometry, a Kepler–Poinsot polyhedron is any of four regular star polyhedra.
Floor mosaic in St Mark's, Venice (possibly by Paolo Uccello)
Stellated dodecahedra, Harmonices Mundi by Johannes Kepler (1619)
Cardboard model from Tübingen University (around 1860)
Alexander's Star