The "Star of David" is actually an ancient esoteric Hermetic symbol representing the interlocking of male and female to produce a whole, it is also somewhat akin to yin and yang. The upward triangle depicts male energy an the downward triangle female. If your desire to know more is intensifying, you'll have to look into on your own; When the time is ready, the knowledge will find you I don't think Jews even used this symbol until well into the middle ages when the ancient mystery schools were being rediscovered by scholars in Europe.
Another example is the use of Owls which represent Minerva (Athena in Greek), the goddess of wisdom and strategic warfare. It has been also stolen and twisted, and is now most commonly found in cabal symbology.
Masons, along other less known societies, were formed to protect and guard the knowledge of ancient mystery schools and to continue the traditions associated these ancient symbols. Somewhere along the way, Masons were co-opted, corrupted, and turned into the destroyers of civilization rather than its defenders. Not all members and lodges are bad, in fact most members are good men clueless of its orders higher mysteries, but the worldwide leadership has been corrupted to the bone.