The Star of David is the generally accepted symbol of Judaism.
The Ten Commandments are a very important sign of Judaism. It is of ten laws that God has given to Moses before Christ for us to still follow today.
This symbol is widely seen as a symbol for Judaism as well. Hanukkah has to do with this symbol as it is part of Jewish culture.
Candlesticks are a very important sign for Jews. In Jewish Mysticism, the Kabalah says that the flame is a symbol of God's relationship to the world and us human beings.
A dress symbol for Judaism is that many men wear a kippah (skullcap) over their heads to show respect for God. Married and religious women also wear a head covering to show their modesty often.