The wall switch is four squares that light up
The switch for many sessions at once is now just its four-square icon: it lights up while the wall is on and goes quiet when it is off.
The wall switch used to carry a word and a sliding track. Now it is the four squares alone, filled and lit while the wall is on, outlined and quiet when it is off.
Screen readers still hear it as a switch named for the wall, and Shift-Command-G still flips it.