Geometric architecture of viruses

Figure 3 Cubic symmetry, the inherent characteristic of polyhedrons. A: Tetrahedron, cube, octahedron, icosahedron and dodecahedron formed of three or more identical faces, identical vertices and identical edges; B: Icosahedral capsid (e.g., T = 1, 3, 4) with principle of axes of symmetry (e.g., 2-3-5 symmetry).