A pentacle was the symbol of Celtic religion, as the Cross is to Christians. Carried by Druids (the learned, priest class), It stood for harmony of the five elements; always pointed up to heaven; signifying wisdom.

The pentagram is a perversion, invented as a satanic symbol by Anton Szandor LaVey, along with the inverted cross. Earlier, it was used by Wicca; itself a perversion of Druidism. They cannot create, they can only pervert and desecrate the holy.