Alpha in the streets, beta in the sheets!
Are you the big, rough dog who wants to be the sub behind closed doors? Well here you go, something kind of subtle but really fun to wear to let people know where you stand and where you kneel.
The identification of the term "Star of David" or "Shield of David" with the hexagram shape dates to the 17th century. The term "Shield of David" is also used in the Siddur as a title of the God of Israel.