szilassi polyhedron
/ʃzˈɪlɐsˌi pˌɒlɪhˈiːdɹən/
Szilassi polyhedron
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Szilassi-polyeder, icke-konvex Szilassi-polyeder
a non-convex polyhedron in geometry that has an unusual property of having no faces that are triangles, despite being composed of triangular faces
