Symbols on temperature graphics in app

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RayB
RayB
edited January 14 in General Questions & Topics

Hi Community

Another newbie question - when I look at the temperature/humidity graphics on the tado app I have noticed that some TRVs have a TRV-looking symbol in the top left corner of the screen - other TRVs have a rectangle with a circle in it. What do they mean and why are they different if all the TRVs are the same ?