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At a guess you're talking about road signs. Rectangular signs give information Triangular signs give warnings Circular signs give orders
A prism can have a triangular cross-section with a rectangular base
A rectangular solid is 3-dimensional, but I'm assuming you mean a 2-dimensional representation of a rectangular solid, which is called a net. Do a search for the following: "net rectangular prism" and you will see a drawing of it.
A rectangular pyramid is a 3-dimensional object called a pentahedron. It has a rectangular base. To each side of the base are attached triangles that rise so as to meet at a single point above the base.
It is a hexahedron, each of whose faces is a rectangle.