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a triangular prism with an apex angle slightly less than 180°: when illuminated by a point source of light it produces two overlapping beams that form an interference pattern on a screen.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6 Various

a prism having a highly obtuse angle to facilitate beam splitting


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  • Bipyramid

    a form symmetrical about a plane dividing it into two pyramids. noun a geometrical form consisting of two pyramids with a common polygonal base

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