It's called an Icosahedron
http://mathworld.wolfram.com/Icosahedron.html
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Depends. What shape is it?
A polyhedron with 20 faces is called an icosahedron.
A pentagonal prism.
the net of a shape is how many sides of a shapeThe net of a solid shape is a flat arrangement of its faces faces which can be folded together to make the solid shape. See related links, below.
An decagonal prism.