\u001F (C99)\U00001F (C99)\x1F (encoding-dependent)\037 (encoding-dependent)\u{1F} (C++23)\x{1F} (C++23, encoding-dependent)\o{037} (C++23, encoding-dependent)\U0000001F\u001F\x1F (encoding-dependent)\037 (encoding-dependent)\u001F\u{1F}\u001F\x1F\1F\00001F=1F%1F