From Longman Dictionary of Contemporary Englishpentagrampen‧ta‧gram /ˈpentəɡræm/ noun [countable] CFROMa shape like a star with five points, often used as a magic sign
Examples from the Corpus
pentagram• She has clearly made a lot of sacrifices in her life-mostly involving goats and a pentagram.• It was draped with a black cloth and embroidered with a gold pentagram.• Cut an apple across the middle and the center will reveal a perfect pentagram.• The pentagram, left undisturbed in its place, radiates a zone within the room. 