Devil’s Trap (Symbol)

Origin
The devil’s trap is a mystical symbol used to imbolise and control demons. The devil’s traps seen in Supernatural all originate from 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 Lesser Key of Solomon. See also Heptagram.