An octagonal prism has two parallel faces that are octagons and parallelograms connecting them.
A rectangular prism is like a box.
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An octagonal prism.
An octagon-based prism.An octagon-based prism.An octagon-based prism.An octagon-based prism.
A stop sign. A octagon looks like a stop sign. It has 8 sides.
cube
a box