Pentagonal trapezohedron
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In geometry, a pentagonal trapezohedron is the third in the infinite family of trapezohedra, face-transitive polyhedra. Its dual polyhedron is the pentagonal antiprism. As a decahedron it has ten face
Trapezohedron 5
Ten-sided dice
Dice
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A die is a small, throwable object with marked sides that can rest in multiple positions. Dice are used for generating random values, commonly as part of tabletop games, including dice games, board ga
Pentagonal trapezohedron
…group as the pentagonal antiprism, the five-fold antiprismatic symmetry D 5 d of order 20. The pentagonal trapezohedron was patented for use as a gaming die (i.e. "game apparatus") in 1906. These dice are used for role-playing games that use percentile-based skills; however, a twenty-sided die can be labeled…
Four traditional dice showing all six different sides
Terracotta die from Mohenjo-daro, c. 2600-1900 BCE
Knucklebones die, made of soapstone
Twenty-sided serpentinite die from Ptolemaic Egypt