Help Arrow icon in top left corner of screen

[bandsawman]

I've got an icon in the top left-hand corner of my screen - it's a white block arrow, pointing left, with a minus sign on it.
Does anyone know what it is?

 

[breezex]

Notifications are turned off. Turn them on and it goes away.

 

[SUroot]

every day.....

 

[bandsawman]

Flippin' 'eck...
Thanks