In my experience, 5 sided, equal length polygons are much more often called pentagons than pentagrams.
pentagram - from
dictionary.comn. [Gr. ?, neut. of ? having five lines. See Penta-, and -gram.] A pentacle or a pentalpha.
n : a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon [syn: pentacle]
