
BUY ANIMATIONS 
An icosahedron is a solid with 20 faces each composed of (in a regular icosahedron) equilateral triangles. It has 12 vertices and 30 edges and it is an efficient way of constructing a spheroidal container using simple repeating units, which is why it is the favoured form of viral capsids.
In its regular form it is one of the five Platonic solids: