I read that the six points of the Star of David symbolize the future powers of the Messiah:
· Wisdom
· Understanding
· Counsel
· Heroism
· Knowledge
· Fear of the Lord (According to Yeshayahu Chapter 11:2)
I read another interesting interpretation of these six points on the late Rabbi S"Z Kahana website. He wrote that he knew people who see the Shield of David as a protector of the human spirit which is in the center of the six directions:
· Up
· Down
· East
· West
· North
· South
Others say that the six points relate to six possible ways of contact that a Hebrew man has with the land of Israel:
· Didn't see it
· Saw it from a distance
· Entered and got out
· Entered and stayed for the rest of his life
· Born in Israel and lived there
· Died abroad but his bones were brought to Israel