Icons are written language, culture that is transmitted across generations. The floppy disk symbol stuck and that's what we're left with, it could have been any

Icons are written language, culture that is transmitted across generations. The floppy disk symbol stuck and that's what we're left with, it could have been any symbol really. It's actually how all alphabets evolve, some Sumerian would draw a cow and then it would be simplified and generalized over time until some unrecognizable symbol meant "wealth" or something like that.