A tetrahedron, also called an equilateral triangular pyramid
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A pentomino is a polyomino composed of five congruent squares, connected along their edges. They look a bit like nets, but with only 5 squares. Or some of the 5 square blocks in tetras.
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Depending on their shapes and sizes you can make plane shapes with 3 to 24 sides.
a polygon is a closed up shape with vertices and sides ,for example a triangle is a polygon because it is made up of 3 sides and 3 vertices
A rectangular prism is the only shape that is made up from only rectangular faces. But there are countless shapes which contain rectangular faces along with other shapes.