What is this icon for?

[Nidza]

I turned off and on every settings in notification but this icon won't turn off.

 

[chanchan05]

Do you have SystemUI Tuner installed?

 

[methodman89]

Could be a screen share icon

 

[Nidza]

I use system ui but delete it.

 

[Nidza]

Do you have SystemUI Tuner installed?

It is systemui tuner for auto rotate screen, thanks a lot.