\u0009 (C99)\U000009 (C99)\t\x09 (encoding-dependent)\011 (encoding-dependent)\u{9} (C++23)\x{09} (C++23, encoding-dependent)\o{011} (C++23, encoding-dependent)\t\U00000009\u0009\x09 (encoding-dependent)\011 (encoding-dependent)\t\u0009\u{9}\u0009\t\x09\9\000009=09%09