It is called a rectangular prism.
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There isn't: for all faces to be rectangles there have to be 6, of which opposite sides are equal in length and breadth. (A cuboid)
3 dimensional. A rectangular prism is basically a box where all 6 sides are rectangles (some can be squares, which are just special cases of rectangles). If all six are squares then the rectangular prism is a cube.
The sides of a rectangle are not all equal so a rectangle is not a regular polygon. And, as a consequence, any 3-dimensional shape made from rectangles cannot be a regular polyhedron.
rectangles and squares have
If the shape is two-dimensional then it is a circle, if the shape is three-dimensional then it's a sphere.