Please explain it in a simple language to understand it properly

Icosahedral Capsids: In these structures, the subunits are arranged in the form of a hollow, quasi spherical structure, with the genome within. An icosahedron is defined as being made up of 20 equilateral triangular faces arranged around the surface of a sphere. They display 2-3-5 fold symmetry as follows: An axis of 2 fold rotational symmetry through the center of each edge. An axis of 3 fold rotational symmetry through the center of each face. An axis of 5 fold rotational symmetry through the center of each corner.