Pentagram

The Pentagram is probably the most recognizable symbol of Paganism and witchcraft.
Used in a broad range of traditions and cultures, the pentagram has a number of interpretations.
In Pagan traditions, the five-pointed star represents the five elements- Earth, Air, Fire, Water and Spirit.
Drawn in a continuous line, the star represents the interconnectedness of the Elements.
The outer ring symbolizes the cycles of nature, as well as the Sacred Circle.

The symbol is called a Pentagram in 2-dimensional form (when drawn, for example).
In 3-dimensional form (coins, jewelry, etc.) it is called a Pentacle.