What does SIDED stand for? 

sided

In geometry, the snub icosidodecadodecahedron is a nonconvex uniform polyhedron, indexed as U46. It has 104 faces (80 triangles, 12 pentagons, and 12 pentagrams), 180 edges, and 60 vertices. As the name indicates, it belongs to the family of snub polyhedra. The circumradius of the snub icosidodecadodecahedron with unit edge length is 1 2 2 ρ − 1 ρ − 1 , {\displaystyle {\frac {1}{2}}{\sqrt {\frac {2\rho -1}{\rho -1}}},} where ρ is the plastic constant, or the unique real root of ρ3 = ρ + 1.

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