It depends on whether the faces are squares or triangles:
The answer is either a cube or two triangular pyramids (tetrahedra) attached base-to-base.
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cube
A cube
A cube
A rectangular prism has 6 faces, they are grouped into three pairs of parallel, identical faces. A common rectangular prism is a regular box.
a square. duuh. * * * * * duuh is correct! A square has 4 identical sides or 4 identical angles but not 4 identical faces! A shape with four identical plane faces is a regular tetrahedron or a triangle based pyramid.