If you mean by real life examples, then take a standard tissue box. (No, not the cube-shaped one.) Then there's a book, although its rectangles are not the same all around.
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Shoe boxes, CD cases, books.
A CPU (the box next/under to your computer)...hope that helped...
Cubes have a square on each side, but rectangular prisms have rectangles or squares.
They can be rectangular prisms.
They are polyhedra.