The one I REALLY HATE is the paper orientation icon on printer paper trays. Ones like these: https://static.thenounproject.com/png/4256363-200.png Do the lines on the paper mean "insert the side that already has writing face up, and the side that is blank face down" OR "these lines represent what will happen after you print but they're just being represented here for your imagination purposes even though they aren't…
Likewise the indication (if any) on a sheet-fed scanner tray that tells you whether to put the paper in face up or face down. I've taken to just writing instructions to myself on that type of thing with a sharpie, using actual text, and/or an actual diagram. It works well with the usual beige plastic. If it's black, I usually put it on a small piece of paper and tape it somewhere it won't interfere with the operation…
Yes. Cars used to have words like "OIL" or "TEMP" or "BRAKE" or "SEAT BELT" in the dashboad warning lights. That switched to icons, probably as a cost-savings so they could use the same parts worldwide. But at a cost in clarity.
Now that most new car dashboards have programmable LCD displays or at least a message area, better/more descriptive fault descriptions have returned.