+dkMathSymbols.item[chr(0x00e7)] := "{u+2245}" ; (ç -> ≅) congruent to
+dkMathSymbols.item[chr(0x00c7)] := "{u+2247}" ; (Ç -> ≇) not congruent to
+dkMathSymbols.item[chr(0x00e2)] := "{u+225d}" ; (â -> ≝) equal to by definition
+dkMathSymbols.item[chr(0x00c2)] := "{u+225d}" ; (Â -> ≝) equal to by definition