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Bifrustum
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, an n-agonal bifrustum is a <a href="/facts/Polyhedron/UC0p9FTF">polyhedron</a> composed of three parallel planes of <a href="/facts/Polygon/yAq7RjPz">n-agons</a>, with the middle plane largest and usually the top and bottom congruent. </p><p>It can be constructed as two congruent <a href="/facts/Frustum/TEfLWynX">frusta</a> combined across a plane of symmetry, and also as a <a href="/facts/Bipyramid/MkzrCA0W">bipyramid</a> with the two polar vertices truncated. </p><p>They are <a href="/facts/Dual_polyhedron/rkIHbmAf">duals</a> to the family of <a href="/facts/Elongated_bipyramid/RknyULra">elongated bipyramids</a>. </p>