\u0011 (C99)\U000011 (C99)\x11 (encoding-dependent)\021 (encoding-dependent)\u{11} (C++23)\x{11} (C++23, encoding-dependent)\o{021} (C++23, encoding-dependent)\U00000011\u0011\x11 (encoding-dependent)\021 (encoding-dependent)\u0011\u{11}\u0011\x11\11\000011=11%11