Pentagram

A pentacle is a symbol or amulet used for protection. Unlike what is commonly believed, pentacles are a very powerful protection against evil.

Usage
Used for protection....

Origin
A pentacle (or pantacle in Thelema) is an amulet used in magical evocation, generally made of parchment, paper or metal (althought it can be of other materials), on wich the symbol of a spirit or energy being evoked is drawn. It is often wornd around the neck, or placed within the triangle of evocation. Protective symbols may also be incluses (sometimes on the reverse), a common one being the five-point form of the Seal of Solomon, called a pentacle of Solomon or pentangle of Solomon. Many varieties of pentacle can be found in the grimoires of Solomonic Magic; they are also used in some neopagan magical traditions, such as Wicca, alongside other magical tools.