Prosigns for Morse code

Morse code prosigns or procedural signals are special unique dot/dash sequence symbols e.g. (· — · —) that do not represent written or printed alpha-numeric or punctuation text characters. Prosigns are special unique stand alone (normally unwritten) Morse code symbols, that have particular functions, such as: indicating changes of transmission communications protocol status, and indicating (or initiating) textual white space formatting. These special Morse symbols, although preceding modern teleprinter (teletypewriter) and computer character set control characters by many decades, play a role similar to the (normally unprinted) control characters of modern computer and teleprinter character set codes such as the: Baudot, Murray, ITA2, ASCII, Unicode and EBCDIC codes.