Icosahedron
A icosahedron is a type of symmetrical polyhedron with 20 faces, 12 vertices, and 30 edges, where each face is an equilateral triangle, and it's one of the five Platonic solids.
A icosahedron is a type of symmetrical polyhedron with 20 faces, 12 vertices, and 30 edges, where each face is an equilateral triangle, and it's one of the five Platonic solids.
Everything is a system, and every system contains systerms.