What is this button in Ubuntu Gnome 17.04?

Question

linux

What is this button?

Answer 1

Enable/disable automatic screen rotation for the tablet.
If the button is annoying, you can remove it
And reboot.

Answer 2

Click :)

Answer 3

Don't hesitate to press.

Answer 4

Yes, I pressed) Nothing happens. That's interesting what it is.

Answer 5

This is if you have a tablet =)