Wording: NUL(L) byte

Hi everybody! While updating the German translation, I've found several changes of the wording "NUL byte" to "NULL byte". Now I've stumbled upon the isset man page[1], where it says "&null; byte". I think it would be good if there will be a general guideline on how to spell this byte. ASCII uses the abbreviation "NUL"; in C one speaks of "null character" and "null-terminated strings", which are also known as ASCIIZ (note the trailing "Z" for "zero"). Wikipedia seems to prefer the abbreviation "NUL". For consistency, and particularly with regard to translations, I suggest to introduce the character entity reference &nul; (which would have to carefully be distinguished from &null;). I'm not sure whether the respective entity should include the word "byte" or not. Some ideas: <!ENTITY nul 'NUL'> <!ENTITY nul 'NUL byte'> <!ENTITY nul 'null byte'> Thoughts? [1] <http://php.net/manual/en/function.isset.php> -- Christoph M. Becker