\u0008 (C99)\U000008 (C99)\b\x08 (encoding-dependent)\010 (encoding-dependent)\u{8} (C++23)\x{08} (C++23, encoding-dependent)\o{010} (C++23, encoding-dependent)\b\U00000008\u0008\x08 (encoding-dependent)\010 (encoding-dependent)\b\u0008\u{8}\u0008\b\x08\8\000008=08%08