Demonstrating the connection by opposition of the two elements, the alchemical symbol for earth is that of the air, but inverted. Composed of a horizontal line (which can sometimes cut off the apex) placed across the triangle signifying water, the earth sign thus represents stagnant water, which eventually solidifies into matter. The element of Earth is symbolized by the hellhound cerberus and a skull in a three dimensional representation of the icon of Earth: an inverted triangle with a line through it