Mac red title bar button has a black dot

Why is there a black dot on the red button on the top left ( the close button ) ?
It was not there on previous versions, and I don’t think belongs there.

Unity Mac version 2020.1.0a23

5478351--560733--Screenshot 2020-02-13 at 23.14.45.png

The black dot is there when there are unsaved changes. It disappears when saving. This is not new, nor specific to Unity. This has been MacOS functionality for years.

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Thanks the explanation, I thought I did not see it in 2019 but it makes sense.