Icon flashes on top corner of my HTC, what is his?

[AC Question]

icon flashes on top corner of my htc what is his?

Its a hollow square with 3 lines in the middle of the square.

 

[Javier P]

Re: icon flashes on top corner of my htc what is his?

Where do you have this icon? Is it on your status bar? Can you get any information expanding the notifications? What happens if you long press on it?