4 faces: tetrahedron; a pyramid with a triangular base has 4 faces.
5 faces: pentahedron; A triangular prism (the sort you make a rainbow with) is a pentahedron; a square pyramidis a pentahedron - it has a square base and 4 triangular sides.
6 faces: hexahedron; a regular hexahedron, with all its faces square, is a cube. 7 faces: heptahedron 8 faces: octahedron
9 faces: enneahedron
10 faces: decahedron
11 faces: hendecahedron 12 faces: dodecahedron
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3dimentional figures are solid figures.
Figures that take up space.
If it is 3 dimensional it is an icosahedron If it is 2 dimensional it is an icosagon
The general term is "solid shapes"; some examples are sphere, pyramid, cone, rectangular prism.