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The devil’s trap is a mystical symbol used to imbolise and control demons. The devil’s traps seen in ''Supernatural'' all originate from [http://en.wikipedia.org/wiki/The_Goetia:_The_Lesser_Key_of_Solomon_the_King The Lesser Key of Solomon], which is grimoire or magical text written in the 17th century. It contains rituals and spells for invoking and controlling both demons and angels.
The devil's trap seen painted on the ceiling at [[Bobby]]'s house is composed of two pentacles from the [http://www.esotericarchives.com/solomon/ksol.htm#chap18 Lesser Key of Solomon]
[[Image: Grandpentacle.gif|left|thumb|350px|The Grand Pentacle:"It serves to convene all spirits; when shown to them they will bow and obey you"]]