A note on the orthography of "§" ... I agree that "§" is a GOOD "section marker". It was, and probably still
is, extensively used in legal documents to mark sections. In the past it
was also used quite a lot in books with lots of sections.
HOWEVER,
the layout of a standard PC "US Keyboard" lacks it. The standard PC "US
International Keyboard" also lacks it.
https://en.wikipedia.org/wiki/British_and_American_keyboards.
Its likely to be on some PC keyboards in some countries. It IS on my Italian keyboard where its used to represent "double s", though actual use of it for that is rare now.
As far as I can see it is NOT on all Mac keyboards either:
https://support.apple.com/en-us/HT201794.
Best wishes
Josiah