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A square based pyramid, a square based prism, and any one of infinitely many other 3-dimensional shapes.
A rectangular pyramid is a solid (3-dimensional) figure that comes to a point opposite the base (like the Pyramids of Egypt.) Its base is a four-sided plane figure with right angles and opposite sides equal (a rectangle--or square for that matter).
Square pyramid
You are a pyramid!
cone that is my answer
I believe it is a cone, if you are intending for us to tell you the 3d figure.