A dodecahedron is a generic term which describes a 3-dimensional shape with 12 polygonal faces. There are approx 6.4 million topologically different convex dodecahedra plus concave ones. They can have 8 to 20 vertices and 18 to 30 edges. A hexagonal bipyramid has only 9 diagonals whereas a regular dodecahedron has 170 (I think).
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A dodecahedron can have 8 to 20 vertices.
A dodecahedron has 12 sides.
a dodecahedron has 20 vertices and 12 faces
A dodecahedron need not have any parallel lines.
It has 1,345,890 diagonals