I have a feeling that this is a silly question, but would someone please tell me what the icon is immediately after the device name, please?

It looks like a play symbol, but it doesn't change with play/pause, nor does it seem to be responsive to touch.
The Devices page in the current user manual doesn't show it.
The two devices are an Amp, and an Amp Pro.
thanks very much indeed.

It looks like a play symbol, but it doesn't change with play/pause, nor does it seem to be responsive to touch.
The Devices page in the current user manual doesn't show it.
The two devices are an Amp, and an Amp Pro.
thanks very much indeed.