If you enter "data" instead, you'll get the full context of the only one of those four which is applicable. I could quibble with some details of how these icon

If you enter "data" instead, you'll get the full context of the only one of those four which is applicable. I could quibble with some details of how these icons are designed, but I like that read and write point in the same directions as the carets in Unix redirects. That leaves up for "make data leave this device and go elsewhere", with down for "make a local copy of this data", aka upload and download. I must confess, however, if I saw the ISO icons in the wild, I wouldn't understand them. This is while already being aware of their existence.