A radiogram is a formal message routed by amateur radio operators through the National Traffic System (NTS). A radiogram is initially written down using a paper form to help organize and normalize the information. The radiogram is relayed to volunteer radio operators who also use the radiogram paper form to copy and pass the message onward.
The radiogram has been in use for a very long time in amateur radio and retains its usefulness in emergency situations when fragile infrastructure-based communication such as Internet and telephone fail.
Good DX and 73, NJ2X