Pagan symbols are actually quite interesting and controversial as well. There is confusion between many people as to what is Pagan and what is Wiccan; however, some are very similar.
There are five basic symbols in Paganism that all Pagans learn.
Earth is symbolized by a triangle upside down with a horizontal line 1/4 from the base of the triangle. It is also used to represent all things in the physical world.
Air is symbolized by a triangle sitting on its base with a line 1/4 of the way up from the base. It is also used to represent all things in the spiritual world.
Fire is symbolized by a simple triangle sitting on its base and also represents the power and vision of the divine.
Water is symbolized by a reverse simple triangle. It also represents cleansing.
The last elemental symbol is resenting the 5th element.
That is the Element of Spirit. By uniting Fire and Water - the power and vision of the divine while cleansing on oneself first; then you can begin to use and feel the power of the element of the Spirit.