What is a Pentacle/Pentagram
It's a very ancient symbol... some ask "why was it chosen as our sign?" Well, it represents a lot magically. Here they are directly from the Dictionary of the Mystical:
Pentacle
A disc (generally circular) which is inscribed with a pentagram on its surface. This image is pretty close:
PENTACLE
Pentagram
A five-pointed star drawn with a single line. Upright, it resembles a human figure, with spirit taking the highest importance. Inverted (upside-down) it is often considered a Satanic symbol. This is not always true, though. In Wicca an inverted pentagram is a sign used by a second degree initiate to symbolise their progress and the facing of the "dark" side of life. When inverted, it represents the elements taking precedence over spirit.
PENTAGRAM