pentagram

noun

1. a five-pointed, star-shaped figure made by extending the sides of a regular pentagon until they meet, used as an occult symbol by the Pythagoreans and later philosophers, by magicians, etc.

noun

1. a star-shaped figure formed by extending the sides of a regular pentagon to meet at five points
2. such a figure used as a magical or symbolic figure by the Pythagoreans, black magicians, etc

n.“five-pointed star,” 1820, from Greek pentagrammon, noun use of neuter of adj. pentagrammos “having five lines,” from pente “five” (see five) + gramma “what is written” (see grammar).