"AM" in radio context generally means medium wave, not shortwave.
But even commercial pilots know their radios are AM for instance.
Does it include LW/MW only, or is shortwave also called "AM radio"?
I don't think it's just a US or NA thing. In my experience, at least, every casual consumer radio I ever handled that had English labels on it, outside of vintage stuff, used this terminology. More advanced consumer radios like Tecsun will usually avoid "AM" and use LW/MW/SW as appropriate, but then still refer to VHF as FM.
I referred to pilots as a counter example.
We know what AM really means and we call it a “radio.”
People also say CB radio - I’ve never heard it referred as a transceiver by that group. Hams, both.