That's the new "universal" power symbol. I really didn't like the old one (universal power symbol, I mean -- see attached image) because it was backwards from a circuitry point of view, showing a closed circle for off (when the circuit is
open) and a straight line for on (when the circuit is
closed).
The new symbol clearly conveys that it's a circuit and it's interruptable by that control. Not necessarily clear like that to everyone, but it's no
less clear to the general populous than the other was, and it isn't
backwards to those who are circuit saavy.
Of course that has nothing to do with anything.
