Small stellated dodecahedron
In geometry, the small stellated dodecahedron is a Kepler-Poinsot polyhedron, named by Arthur Cayley, and with Schläfli symbol {5⁄2,5}. It is one of four nonconvex regular polyhedra. It is composed of 12 pentagrammic faces, with five pentagrams meeting at each vertex.
Floor mosaic by Paolo Uccello, 1430
Image: Small Stellated Dodecahedron
Image: Small Stellated Dodecahedron 1
Image: Small Stellated Dodecahedron 2
Kepler–Poinsot polyhedron
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