What about '\\0'?

[gs]

Does Rule 7.1, \"No octal constants (other than zero) and octal escape sequences shall not be used,\" permit the use of the null character, '\\0'? The normative and rule text exempt 0, per se, but make no mention about '\\0'. Prohibitting '\\0' runs, IMHO, contrary to the Principle of Least Surprise. Perhaps someone would show such kindness as to provide me with some clarity?

I appreciate your time in advance.