The physical unit for a numeric state (e.g. °C, %). For a boolean state, there's no unit to show, so this can instead read "true: <label>, false: <label>" (e.g. "true: open, false: closed") to relabel its chart/tooltip instead of the generic On/Off.
Shown on dashboard cards (Components::SensorCard). "source:name" from the icon library, e.g. material:thermostat — an unrecognized name falls back to a generic icon rather than breaking the card. Leave blank for none.