An octagonal prism.
A tent...
Toblerone (a Swiss chocolate)
a box ceareal box printers
Most people will, without hesitation, say a rectangle. In actual fact, though, the paper DOES have a thickness. If it did not, then a stack of dollar bills would still have no height. So, at a very fine level of detail, it is shaped like a rectangular prism.
Butter
An octagonal prism.
The Toblerone box is like a triangular prism; any ordinary box is like a rectangular prism.
It is shaped like cuboid prism
A tent...
Rectangular prism
A pencil
envelope
boxes
Rectangular prism
rectangular prism?
a tent? a block of cheese?