The first emergency call in telegraphy was "CQD" which legend has it stood for "Come Quick--Danger!"
The problem was that the letters "CQ" were used in many different telegraph calls and shorthand messages, and there was a real need for a code that stood out.
The code "SOS" was chosen by the 1906 Berlin Conference, as another answerer said, because it was unique, it stood out from the background jitter on the air, and it was easy to send. You did not have to be an experienced telegrapher to send it. I believe that it was CQD Ummmm. . . I dunno. There was an attempt to use CQD, but there was too much confusion as to what it meant, and at the Berlin Radiotelegraphic Conference of 1906 SOS was officially chosen as the universal distress call.. Before they wrote SOS, Save Our Souls, they probably wrote "HELP" ? What would you do?
S O S ? ? ? ─ ─ ─ -? ? ?-
There was no other code!
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