Eric: Let’s list here a library of notation for the uninitiated (like me).
Toby: If you like, but what we really need to do, I think, is to explain notation right where it's used. So if you put a query box pointing out wherever notation is used that you don't understand, then that might help.
Eric: Sure, but sometimes I come across notation in a reference (not necessarily on the n-Lab) and it is not 100% clear from the context what concept that notation corresponds to. I thought this could be an index of notation that merely points to the correct page.
Toby: OK, fair enough.
Urs: yes, sounds good