One for all the wireless operators, especially Joe Mack and David Dushman.
Look for the famous V for Victory code, in the right-hand column of ‘OPPOSITES’.
According to Cynthia Collins in her internet article: “Beethoven’s Fifth Symphony and Morse Code”, 19 May 2016: ‘In Morse code, “V” is dot-dot-dot-dash, or three short clicks and one long. People equated it with the opening of Beethoven’s Fifth Symphony. That four-note motif was played on the timpani before every BBC wartime broadcast to Europe.’