Earlier quoted context omitted.
"Shebangs" have been defined as '#!' for decades, I'd suggest they not be redefined.
Shebang specifically refers to using an exclamation point to define where data should be directed. Same as it is in Bash scripts, just a different context and slightly different syntax.
https://en.m.wikipedia.org/wiki/Shebang_(Unix)
The word "shebang" has different uses outside of computing, but I can't find any use of the word that refers to a ! without a #