Radiotelephone
a public radio and a private telephone, in one
A radiotelephone is what you get when a private telephone call passes through a radio transmitter — going out, live, to anyone tuned to the right frequency.
On the modern version, every address (your ENS name, or just your 0x) is its own station. You can listen to anyone broadcasting, broadcast from your own address, hold a private call with another address, or do the last two together — broadcasting the call itself as it happens.