Just today, two questions popped up that asked for symbols that aren't necessarily math-specific, but that still are answered by the famous duplicate top dog How to look up a symbol or identify a math symbol or character?.
Can we change the scope and wording of this question so that it applies to all kinds of symbols, perhaps with a slight focus on math symbols? The top answers refer to symbols in general, the lower-ranking are pretty math-specific.
The way it is, I just don't think LaTeX: Numero sign ('№') really is a duplicate of How to look up a symbol or identify a math symbol or character?, because № isn't a math symbol; but it really should be a dupe.
(I proposed this in a comment to the question, but didn't get any reaction.)