Common Notation for Sets or Spaces

Question

Is there some good reference (website could be better) to know the meaning of symbols (generally used) for any "special" kind of sets or spaces like $\mathbb{R}^{2}_{\geq}$?

I've looked up, without success, in:

1. Enlightening Symbols: A Short History of Mathematical Notation and its Hidden Powers (Mazur, 2016).

2. https://en.wikipedia.org/wiki/List_of_mathematical_symbols_by_subject

Answer 1

You might want to explore https://proofwiki.org/wiki/Main_Page which has a more-or-less comprehensive symbols dictionary, but it's not all listed in a neat list, you need to go and find the pages the things are defined on.

Perhaps there's work for someone who has a vision of what it is they want to see in such a list.

Answer 2

I’m not quite sure this is what you’re looking for, but this is a really good reference for different types of algebraic/topological structures:

http://math.chapman.edu/~jipsen/structures/doku.php/index.html

This doesn’t have to do with notation per se, but it does demonstrate a lot of the notation used to express common algebras, topological spaces, orderings, etc.