Ah, what a delightful question! It seems like you're thinking about food in a creative way. Some foods that are shaped like prisms could be certain types of cut vegetables like carrots or cucumbers. Remember, nature is full of beautiful shapes and colors just waiting to inspire your next culinary masterpiece.
An octagonal prism.
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.
A square prism is shaped like a cubid. A square pyramid is a pyramid with a square base.
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
Rectangular prism
envelope
A pencil
boxes
Rectangular prism
a tent? a block of cheese?
rectangular prism?
A dollar bill is truly shaped like a rectangle.