Notification icon that looks like "b" with segmented rings and a circle I have this strange icon that appears in my notification bar (on the right hand side) every once in a while. I have only seen it when running an app in fullscreen, and then checking stuff in the notification bar. It disappears after a few seconds when quitting the full screen app.



(I have HTC One M8 with Android 4.4.4)
It's HTC BoomSound. It shows when sound is playing.