- a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light.
- a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.
- a form having faces parallel to the vertical axis and intersecting the horizontal axes.
- a transparent polygonal solid, often having triangular ends and rectangular sides, for dispersing light into a spectrum or for reflecting and deviating light. They are used in spectroscopes, binoculars, periscopes, etc
- a form of crystal with faces parallel to the vertical axis
- a polyhedron having parallel, polygonal, and congruent bases and sides that are parallelograms
