ASCII Cheat Sheet by Peteris Krumins.
From the post:
I created an ASCII cheat sheet from the table that I used in my blog post about my favorite regular expression. I know there are a billion ASCII cheat sheets out there but I wanted my own. This cheat sheet includes dec, hex, oct and bin values for ASCII characters.
Any cheat sheets to suggest on less popular character sets?
Particularly ones that had font mappings prior to Unicode?