The only two good suggestions I saw were radio buttons as well as toggles with labels on the left & right (so basically two merged radio buttons).
I think the play/pause button in media apps is an acceptable exception simply because it's obvious whether it's playing or not - you could even use it without recognizing the symbol, if music is playing you know a click will pause it.
I think the play/pause button in media apps is an acceptable exception simply because it's obvious whether it's playing or not - you could even use it without recognizing the symbol, if music is playing you know a click will pause it.