Windows key +
; will open up a "emoji menu" with a lot of useful symbols that you can use in your Q/A.
To add on to this, I use WinCompose and would recommend it to anyone who needs to type any sort of symbols frequently. (No affiliation, I just appreciate the project.)
What it is is basically XCompose for Windows, so I can type, for instance, [compose], [a], [e] and get out æ, or more usefully for engineers, [compose], [*], [<any letter>] produces the Greek alphabet "equivalent" of that letter, so [compose], [*], [m] for μ for instance.
You can define custom sequences, too, for any symbols that aren't included in the standard ones, or that you don't like the default sequence for. It works the same as XCompose, right down to having a .XCompose file (well, .XCompose.txt, because windows, but you get the idea).
(I have my left windows key set to be the compose key, as I don't use the windows key very often. You can also use things like scroll lock, the menu key, one of your alt keys, etc.)