A star pentagram has many different meanings; one of them represents the human being each of the four points symbolizes one of the four members of the body (two arms and two legs), and the point that points upwards represents the human head. The star on top of a Christmas tree symbolizes star that announced the birth of Jesus Christ.
1 Additional Answer
A star can represent angels or the struggle between good and bad, night and day. Stars can represent a belief in fairies, a return to childhood, or magic. Stars are seen as universal balance and the heavens.