code: public static String getSymbol(CurrencyUnit cu) {
          try {
              return Waehrung.of(cu).getSymbol();
          } catch (IllegalArgumentException ex) {
              LOG.log(Level.WARNING, "Cannot get symbol for '" + cu + "':", ex);
              return cu.getCurrencyCode();
          }
      }
docs: Lieft das Waehrungssymbol der uebergebenen Waehrungseinheit.
  
  @param cu Waehrungseinheit
  @return z.B. das Euro-Zeichen