It's stylized to the point where it's not really recognizable without prior context, though. A bit like the I / O markings on power switches which are apparentl

It's stylized to the point where it's not really recognizable without prior context, though. A bit like the I / O markings on power switches which are apparently literally meant to be a 1 (on) or 0 (off), which makes perfect sense except they're usually not rendered as numerals and there are too many possible interpretations for it (open vs. closed circuit? "in" / "out"? "inactive" / "on"?) to be easy to figure out just from the markings. This is even more irritating since we're printing things on the switch in the first place, so why not just write "on" / "off" and be done with it?