Meaning of each platonic solid

There are 5 platonic solids which are the only 5 regular polyhedra (possible).

Plato attributed 4 of them to the 4 elements:

• Fire ≡ Tetrahedron
• Earth ≡ Cube
• Air ≡ Octahedron
• Water ≡ Icosahedron

Aristotle added the fifth element "Ether" saying the heavens were made of it; he did not associate the fifth platonic solid, the Dodecahedron, to it.