Check out other symbol libraries

[bhousel]

I was reading this on Apple Maps iconography:
https://www.macobserver.com/news/apple-maps-iconography/

I think several of the icons came originally from the original AIGA Symbol Signs set. There have been a few other symbol sets released in the public domain, and it would be good to review them and pull in anything useful: https://segd.org/tags/edu-symbols