NUL was always just an abbreviation for null: https://www.rfc-editor.org/rfc/rfc20.html#section-4
I don’t think anyone in this thread is confusing the null character with the null pointer.
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I've seen a lot of confusion, where people are talking about checking for a NULL at the end of a list of pointers which is very different to a NUL at the end of a string.
Yes it was an abbreviation in ASCII, as are all the non-printable first 32 codes.