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>Then I drew a square and was done.

I don't get this part.

You mean to highlight the end result? In that case, it would, most of the time, be a rectangle (or try to be).

I was joking, I meant the QED box.

I know about QED, but I am not familiar with the concept of "QED box".

A cursory web search yielded nothing.

It’s a symbol that goes by many names: the tombstone, end-of-proof, or Q.E.D.

"∎"

Interesting.

I wasn't familiar with this, despite being a graduate. Its use might depend wildly on where.