Judaism

The Star Of David A tombstone dating back to 300 BC was found in southern Italy. It had a six-pointed star on it. In 1354, King Carl IV wanted that the Jews of Prague make a flag for themselves. He also wanted this six-pointed star and the five-pointed of King Solomon to be on it. According to Jewish mysticism of the Kabbalah, the number 6 represents the heavens and the earth and the four directions (north, south, east …

…not needed in order to pray. It has been used for other purposes too than only praying. For centuries, many Jews went to study to a shul. It had to have copies of holy books needed for studying, this was even written in the law. In a way, the synagogue (shul) was the first open library in history. Shuls had also schools and the Jewish Law was the first law to make universal education compulsory.