The censoring/redacting used here is insufficient, you can layer the censored text to recontruct sufficient text to identify the website.

Though "null pointer" and "null value" are correct, for bytes it should be "NUL byte", since ASCII code point 0 is NUL.

In Unicode it's named "NULL", line one of UnicodeData.txt[1] is `0000;<control>;Cc;0;BN;;;;;N;NULL;;;;`. Unlike ASCII characters Unicode code point names can be more than 3 letters.

[1] https://www.unicode.org/Public/UNIDATA/UnicodeData.txt

Bytes are not strictly ASCII. Even within the realm of ASCII, if you have a binary with strings terminated in 0x00, those aren't generally called "NUL-terminated strings".