Many years ago universal symbols started being used instead of labels and some questionable symbols are used. This symbol is supposed to denote wheelchair accessible but that wheelchair won't roll very far. How did a magnifying glass become the symbol for searching when it is better suited to magnifying the page size. Then every manufacturer uses symbols on their products that they expect people to understand the meaning of. Did they expect that, at some point, nobody will be able to read? They have to be able to read to go into the operator's manual to find out what the symbols mean.