\u0003 (C99)\U000003 (C99)\x03 (encoding-dependent)\003 (encoding-dependent)\u{3} (C++23)\x{03} (C++23, encoding-dependent)\o{003} (C++23, encoding-dependent)\U00000003\u0003\x03 (encoding-dependent)\003 (encoding-dependent)\u0003\u{3}\u0003\x03\3\000003=03%03