Star Of David
The six-pointed Star of David is a common symbol for both Judaism and Israel. Known in Hebrew as a Magen David (shield of David), geometrically it is two triangles superimposed on each other, forming the shape of a hexagram.
Though today the symbol popularly communicates Jewishness, its associations with Judaism are newer than one might think. Some historians trace it to Jewish communities in the Middle Ages, but these claims are neither fully substantiated nor widely accepted.
What we do know is that in the 17th century, the Jewish quarter of Vienna was marked with a hexagram, to distinguish it from the rest of the city. Around this time, the star also became part of synagogue architecture both in Europe and in the Middle East and North Africa.