Trying to come up with the most legible sans-serif question mark for my Google reCAPTCHA's help icon. The ones that Google use are either too retro or too unreadable (below). I want a question mark ...
I've been doing some research into this symbol (part of ISO 7010), which I'd like to use: but I can't find out whether I'm allowed to or not. Is the glyph in the public domain? What about similar ...