desmic

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• Desmic system — Two desmic tetrahedra. The third tetrahedron of this system is not shown, but has one vertex at the center and the other three on the plane at infinity. In projective geometry, a desmic system is a set of three tetrahedra in 3 dimensional… …   Wikipedia

• Stellated octahedron — Type Regular compound Coxeter Dynkin diagram …   Wikipedia