code: public static String getSymbol(char ch)
      {
          CharInfo info = (CharInfo) fCodeMap.get(Integer.valueOf(ch));
          return (info != null) ? info.fSymbol : null;
      }
docs: Returns a symbol corresponding to the given character or
  <code>null</code> if nothing was found
  
  @param ch for this character the corresponding symbol will be returned
  @return a symbol corresponding to the given character