Geometria Sagrada Tetraedro Mediano
It represents the fire element, the first element in the matter.
It has 4 triangular faces. It's the transmuter element. He's the only one who has leadership, so he lights us up, drives us, moves us towards our goals to realize them. We are lit by passionate love, it leads us to action. It balances internal fire, both by excess and by default. Burn what you no longer need, like an old grudge and lower the fire in those aspects that burn us, like anger.