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That is where your reader shows as an additional icon when connected via USB. It will also be used to show icons for any additional cards in the reader. If you are using a reader that do not use USB connection you will only ever see the icon for the Calibre database displayed there.
If the question is simply why does the "hand" symbol appear wherever the mouse is in the area, I suspect that is just a quirk of the underlying graphic libraries and the way they are being used.
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