some mostly Christian dummies seem to think it's "the symbol of Satan", or whatever, even some even more dumb think it's the jewish star.
But no folks, in that position, this is a symbol of light, and can be associated to Lucifer (the Light Bringer), who has nothing to do with Satan.
Of course it has a lot of different meanings, for Wiccans, Freemasons, gnosticists, etc... what it represents isn't the same.
anyway, for dummies, here's the satanist version [link]
wich represents materialism, soil/earth.