3 ms·

73?

• et-al 3y ago
  It's proto-pager code: https://en.wikipedia.org/wiki/Wire_signal https://en.wikipedia.org/wiki/Wire_signal https://www.pagercodes.com/common-pager-codes.html https://www.pagercodes.com/common-pager-codes.html
• tejtm 3y ago
  It is a salutary morse code "prosign" on amateur radio https://en.wikipedia.org/wiki/Prosigns_for_Morse_code https://en.wikipedia.org/wiki/Prosigns_for_Morse_code edit: I may be overstating that the token is precisely a prosign. But if so it will be one of the closely related early electrical communication codes. https://hamradioprep.com/what-does-73-mean/ https://hamradioprep.com/what-does-73-mean/
• jimnotgym 3y ago
  'Best wishes' but in morse it takes less time to write 73!