While Unitarian Universalists do not have traditional signs or symbols, the flaming chalice, shown with the deep red background, has become widely used in Sunday services.  In the days preceding World War II, the Boston-based Unitarian Service Committee was attempting to rescue Unitarians and other religious liberals from those parts of Europe where lives were threatened by Nazism.  The flaming chalice was the code by which those needing to be rescued identified themselves to the Unitarian Service Committee.  The flame that rises from the chalice represents the light of illumination and understanding.