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What is that symbol called on supernatural???

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So what is that symbol called on supernatural??? Like I dono what its call but it looks like a star with a circle around lol I dono & I look on the net but all I can find is inverted Pentagram,baphomet,pentagram & hexagram but im not 2 sure is 1 of thoso & I really need 2 know whats it call becoz im writin a book & I really need so thx ^ ^