Strange Icon in taskbar

hello at all

what ist this for an icon on the left side of the USB icon?
I never see this bevor. i know whats the icon for, but theres no way to make the icon invisible.

I flasht a new rom, and there is it too.
3 roms i tryed, on 2 is this icon.
i dont like it, because it was never there
is there a way to make this invisible?

i hope you can help me

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