it is of order 3.
By Majid Amin
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2
5
It must have at least one.
One difference: An octahedron has 8 faces, a triangular prism has 5. An octahedron (="eight faces") is a regular high-symmetry solid with all the faces identical. A triangular prism has a triangular base, a triangular roof, and 3 rectangular sides (walls).
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.