You are either talking about a cube or a rectangular prism.
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A rectangular prism is basically a box (look at like a cereal box, for example). There are 6 rectangle faces, and 12 edges.
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cube
A cereal box is a six sided rectangular polyhedron called a rectangular cuboid. Each of its faces has the shape of a rectangle.
An octagonal prism has two parallel faces that are octagons and parallelograms connecting them. A rectangular prism is like a box.