In optics a prism is a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light.
In geometry a prism is a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.
In crystallography a prism is a form having faces parallel to the vertical axis and intersecting the horizontal axes.
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prism refers to a shape, in a more vague term, such as a rectangular prism. which could even define a cube. a pyramid is a specific type of prism
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)