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I'm not sure how to type it, so here's an image drawn using MS Paint:

enter image description here

It's an equals sign and a question mark superimposed on each other. From the times I've seen the symbol, it asks if the LHS is equal to the RHS. If yes, then [do something]. If not, then [do something else]. For example,

a =? b

If yes, then the proof is complete. If not, then we must have b < c ... [yada yada blah blah]

This symbol is not on Wikipedia, so I'm guessing it's nonstandard. If it is indeed nonstandard, then what is the most common way of expressing a =? b?

Allure
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    You'll find some answers here. So for example $a \overset{?}{=}b$. I use it often as $a \overset{(1)}{=}b$, which says that I have used $(1)$ to derive that $a=b$. – Dietrich Burde Nov 07 '22 at 09:33
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    The most common way, however, would be to say:" We need to check whether or not $a=b$. Then the proof is correct." – Dietrich Burde Nov 07 '22 at 09:59

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