7/10 - Ledah looks funny...
A pentagram is traditionally a circle with an upside down star shape inscribed within it. Very similar to the symbol for the band, Him. That is why there is controversy about it.
The pentagram is used primarily for incantations and the like, which are forms of witchcraft. According to the Bible, witchcraft is of Satan. That is why the pentagram is pinned on the devil. The dictionary definition for a pentagram can be found here:
http://dictionary.reference.com/search?q=pentacle