On the Passover Seder plate lies a roasted Egg, or Beitzah in Hebrew. The egg symbolizes many different things.
1) The roundness of the egg resembles the earth and life which constantly is moving in a circle.
2) Life - We are all born from an egg.
3) An egg is the traditional food for mourners and was brought to Jerusalam after the destruction of the temple.
4) The egg symbolizes the spring time since Passover is celebrated during the season of spring.