What is that pop-out icon?

Hey guys, what is the pop-out icon below the topic title? When I click on it, it brings me to the user’s repl.

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Moreover, TL3+ users can unpin this link.

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I think it’s just a way to link your post to a certain URL. I know this is possible if you try to use the link as your title, other than that I’m not sure.

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I think this is useful for sharing repl links as that is a huge problem here.

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