In geometry, a decahedron is a polyhedron with ten faces. There are 32300 topologically distinct decahedra,Gerard Michon: Counting Polyhedra and none are regular, so this name does not identify a specific type of polyhedron except for the number of faces.
Some decahedra have regular faces:
Octagonal prism (uniform 8-prism) Square antiprism (uniform 4-antiprism) Square cupola (Johnson solid 4) Pentagonal bipyramid (Johnson solid 13, 5-bipyramid) Augmented pentagonal prism (Johnson solid 52) Augmented tridiminished icosahedron (Johnson solid 64)
Decahedra with irregular faces include:
Pentagonal trapezohedron (5-trapezohedron, antiprism dual) often used as a die in role playing games, known as a d10 Truncated square trapezohedron Enneagonal pyramid (9-pyramid) Ten of diamonds decahedron - a space-filling polyhedron with D2d symmetry Chamfered tetrahedron Square bifrustum
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