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12
The prefix is dodeca- which, in Greek, refers to 12.
Dodecagram dodecagon
A dodecahedron has 20 sides, which are all pentagons. "Dodeca" means "do" (2) times "deca" (10).
A dodecahedron is a 3-dimensional shape with 12 (dodeca-) polygonal faces. There are more than 6 million different types of convex dodecahedra. For example, a hendecagon based (11-sided polygon) pyramid, which has 12 vertices;a decagon based prism, which has 20 vertices;a hexagon based dipyramid which has 8 vertices.Then there is the regular Platonic solid, made out of 12 regular pentagonal faces. This has 20 vertices.