WORLDKINGS - On This Day - July 01, 2022 - "SOS" (• • • – – – • • •) distress signal becomes the worldwide standard for help in 1908

30-06-2022

(Worldkings.org) SOS is the International Morse code distress signal (• • • – – – • • •); the bar over it indicates to omit the normal gaps between the letters. It is used as a start-of-message mark for transmissions requesting help when loss of life or catastrophic loss of property is imminent, as opposed to CT = KA which precedes a routine message. Other prefixes are assigned for mechanical breakdowns and requests for medical assistance.