Great icosahedron

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Notion

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Science and technology

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What Wikipedia says

In geometry, the great icosahedron is one of four Kepler–Poinsot polyhedra (nonconvex regular polyhedra), with Schläfli symbol {3,5⁄2} and Coxeter-Dynkin diagram of . It is composed of 20 intersecting triangular faces, having five triangles meeting at each vertex in a pentagrammic sequence.

Excerpt from the Wikipedia article “Great icosahedron”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, Attribution, via Wikimedia Commons.