A little while ago this new icon showed up in my notification tray, it looks like two squiggly vertical lines inside a rectangle. I don't know what it is for or how to get rid of it, and there is no associated notification when I open the notification drawer. Does anyone know what it is? I have a OnePlus One running the current version of Cyanogen (based on Android 5.0.2, in the attached screenshot it is the leftmost icon in the group on the right).
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