High Quality Content by WIKIPEDIA articles! In geometry, the octagonal prism is the sixth in an infinite set of prisms, formed by square sides and two regular octagon caps. If faces are all regular, it is a semiregular polyhedron. In optics, octagonal prisms are used to generate flicker-free images in movie projectors. It is also an element of two four-dimensional uniform polychora: the omnitruncated tesseract and runcitruncated tesseract. A right prism is a prism in which the joining edges and faces are perpendicular to the base faces. This applies if the joining faces are rectangular. If the joining edges and faces are not perpendicular to the base faces, it is called an oblique prism.

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