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Pentagonal trapezohedron
Type	trapezohedra
Faces	10 kites
Edges	20
Vertices	12
Face configuration	5,3,3,3
Symmetry group	D5d
Dual polyhedron	pentagonal antiprism
Properties	convex, face-uniform

The pentagonal trapezohedron or deltohedron is the third in an infinite series of face-uniform polyhedra which are dual polyhedron to the antiprisms. It has ten faces which are congruent kites.

Uses

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Most hobby games stores sell dice of this shape, which are often referred to as "d10" in tabletop gaming. Two of them, either of different colours or one labelled 00-90, are often used to generate random numbers in the range 01-100 by using one die as "tens" and the other as "units". Two zeros, or a 0 and a 00, are usually taken to mean 100.