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A fresnel biprism is a triangular right prism with a highly obtuse angle in cross-section. The obtuse angle is near 180 degrees. The typical use of such a prism is to produce two coherent "virtual" light sources from one real point source. These virtual sources can be used to demonstrate interference.
There's the rectangular prism, the triangular prism, hexagonal prism, pentagonal prism, the cube, and the octagonal prism.
A Triangular Prism A Rectangular Prism An Octogonal Prism (basically 3D Shapes)
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
Cylinder (circular prism) Cube (square prism) Cuboid (rectangle prism)