I don't know where this comes from. I can't click it, it is only present on the second display; when I mirror displays it goes away. Does anyone have an idea what this could be?

enter image description here I realise a reboot/logout will probably fix it, but I'm curious as to what this is and whether there is some method which will tell me, to which process it belongs.

System: 10.10.5, Mbp 9,2

Edit: Turns out it was Finder. When logging out, I got a popup saying that some operations are still in progress, although I don't know what.

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