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Aside from being a Game of Thrones reference, "Dragonglass" appears to be a code name for a smart display device, or for smart display functionality. https://9

• senectus1 5y ago
  ooh I was hoping it would be a minor leak about something like that :-D
  • cmrdporcupine 5y ago
    Not much of a leak; it's a codename from 4 or so years ago now. Not sure if it still applies for the more recent versions of this UI, which were rewritten. (I worked on the home hub display assistant devices which were one of the things that ran a 'dragonglass') Strictly speaking I guess code names are "secret", but this one is pretty old already.