I do un*x shell since the 90s, before linux, maybe this is why I have always called it that way

In France it was “dièse” (like “sharp” in music) and it became hashtag too. In Québec it’s the “carré” meaning the square, and people says hashtag now too.

I have always called that shebang.

reminds me of one I took in Paris

well, I’m 55, so the 20 of them, and some I still says once a week :)

Being 55 and listening to FM radio (music, no talk), you are absolutely right.