LibreOffice has used an arrow pointing to a hard drive for a while, but that's also outdated.
The trend has been to move away from saving as a distinct action in favour of constant auto saving, so I don't know if canonicalising a wholly new icon is in the future.
The download icon might not be an awful choice in some contexts.
Symbolic icons should never use words to convey their meaning. Some of us are dyslexic, some of us don't speak the language, some of us are blind as shit, etc.
Labels composed of letters to form otherwise meaningful words, it's still not a great option in terms of user accessibility. If even a couple of icons used similar words/ letters as their iconography, then suddenly it becomes an irritating nightmare just trying to identify which is which without breaking the flow of what your doing. If anything, a simple S would be acceptable, but that brings its own problems