The Star of David is called the Shield of David in Hebrew. It is named after King David of ancient Israel; sometimes it is called the Seal of Solomon after his son, King Solomon. The number seven has religious significance in Judaism, e.g., the six days of Creation plus the seventh day of rest, the six working days in the week plus Shabbat, the Seven Spirits of God, as well as the Menorah in the ancient Temple, whose seven oillamps rest on three stems branching from each side of a central pole. And so on. Perhaps, the Star of David came to be used as a standard symbol in synagogues because its organization into 3+3+1 corresponds to the Temple's Menorah, which was the more traditional symbol for Judaism in ancient times.It is a generally recognized symbol of Judaism and Jewish identity and is also known colloquially as the Jewish Star. Its usage as a symbol of Judaism and Jewish identity began in the Middle Ages, alongside the more ancient symbol of the menorah. This six pointed star is the premier symbol of Judaism. In 1897, it was adopted as the symbol for the First Zionist Congress, and, in 1948, it became the central figure in the flag of the state of Israel.