A headstone can be a rectangular pyramid.
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You'll find real live examples of pyramids in the country of Egypt
if you need to find the volume of the pyramid in rome
A CPU (the box next/under to your computer)...hope that helped...
an Egyptian pyramid
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.