````\u0060 (C99)\U000060 (C99)\x60 (encoding-dependent)\140 (encoding-dependent)\u{60} (C++23)\x{60} (C++23, encoding-dependent)\o{140} (C++23, encoding-dependent)\U00000060\u0060\x60 (encoding-dependent)\140 (encoding-dependent)\u0060\u{60}\u0060\`\x60\60\000060=60%60