Decahedron

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In geometry, a decahedron is a polyhedron with ten faces. There are 32300 topologically distinct decahedra^[1]^[2] and none is regular, so this name is ambiguous.

With regular faces:

With irregular faces it can also be:

Pentagonal trapezohedron (5-trapezohedron, antiprism dual) — often used as a die in role playing games, known as d10
Enneagonal pyramid (9-pyramid)

References

Polyhedra

Listed by number of faces

1–10 faces	Monohedron Dihedron Trihedron Tetrahedron Pentahedron Hexahedron Heptahedron Octahedron Enneahedron Decahedron

11–20 faces	Hendecahedron Dodecahedron Tridecahedron Tetradecahedron Pentadecahedron Hexadecahedron Heptadecahedron Octadecahedron Enneadecahedron Icosahedron

Others	Triacontahedron Hexecontahedron Enneacontahedron Apeirohedron

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