\u001C (C99)\U00001C (C99)\x1C (encoding-dependent)\034 (encoding-dependent)\u{1C} (C++23)\x{1C} (C++23, encoding-dependent)\o{034} (C++23, encoding-dependent)\U0000001C\u001C\x1C (encoding-dependent)\034 (encoding-dependent)\u001C\u{1C}\u001C\x1C\1C\00001C=1C%1C