My answer to What was the symbol for the jewish religion before the introduction of the star of david?
Answer by Jason Corning:
The Seven-Branched Menorah. There are, however, numerous similarities between the two symbols. I originally posted the following on Facebook and I'll post it again here:
More than few experts on the subject- namely ordained Orthodox Rabbis- believe there are strong links between the actual Menorah and the Star of David. For example- both structures have a 7-part form in that there are 7 branches of theMenorah and 7 parts to the Star of David. Delving further, one finds they share 6 +1 design where the Menorah's 6 outer branches plus 1 central branch correspond to the 6 outer points plus 1 central hexagon. In addition both the Menorah and the Star of David can be organized an even more complex design of 3 + 3 + 1. This can be seen as follows:l
7 Menorah = 7 Star of David
3 branches to the right = 3 points above
3 branches to the left = 3 points below
1 center branch = 1 central hexagon