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dodecahedron
icosahedron (its a 20 sided trinagular faced polyhedron)
A polyhedron with 20 faces is called an icosahedron.
A six sided polyhedron is a hexahedron. This may be a triangle based dipyramid, a pentagonal pyramid of a variant of a parallelepiped.
A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.