You probably want to have text in UI. :) I mean it's fine for physical things to avoid it, as you probably don't want to manufacture 200 different power on but

You probably want to have text in UI. :) I mean it's fine for physical things to avoid it, as you probably don't want to manufacture 200 different power on buttons for your TV. But in software, I like UI's using text much more than the icon/graphics using ones.