33\u0033 (C99)\U000033 (C99)\x33 (encoding-dependent)\063 (encoding-dependent)\u{33} (C++23)\x{33} (C++23, encoding-dependent)\o{063} (C++23, encoding-dependent)\U00000033\u0033\x33 (encoding-dependent)\063 (encoding-dependent)\u0033\u{33}\u0033\x33\33\000033=33%33