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).
a square pyramid, perhaps a rectangural prism with a square pyramid on top
No. A flat, 2-dimensional figure can be a quarilateral - a square for instance. A 3-dimensional figure like a sugar cube, which is a solid and has thickness, cannot. For solid shapes, names like 'Parallelepiped and rhombohedron' are used.
cone that is my answer
By the shape...
A three dimensional solid figure looks like a cube or a prism. Pyramids are three dimensional solid figures as well.
You are a pyramid!