I asked a question requesting a good ASCII table a few years ago on SO and it was closed, it has since been deleted and I don't think it's worth it to start a SE site for ASCII table enthusiasts (Maybe ASCII art enthusiasts would work).
Anyway, if there was an extremely limited appendix on SO that would be really helpful. It might solve the 'General Reference' issue and make my life easier. It could be written by the more prolific and pedantic tag wiki authors.
I only ask this because I can't find the ASCII table I usually use since I cleaned my desk two days ago. But it's an idea, maybe a novel one. I can't tell from the related questions, downvote accordingly ;-)