Does anybody know how to make a back button - the one that looks like this: < ?

Question

When you are making a code on Sololearn, and you want to go back, there is a back (<) button at the top left.

I don't think it's made with this:< (it just looks like it.)

I'm not expecting you guys to make me a code to make that button. Im wondering what the code is if there is one for it.

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