SOS is the international Morse code distress signal
(· · · – – – · · ·). This distress signal was first adopted by the German government. In both the April 1, 1905, German law, and the 1906 International regulations, the distress signal was specified as a continuous Morse code sequence of three-dits/three-dahs/three-dits, with no mention of any alphabetic equivalents. The SOS distress call has always been transmitted as a continuous sequence of dits and dahs, and not as individual letters. SOS is the only nine-element signal in Morse code, making it more easily recognizable, as no other symbol uses more than eight elements.
I was just about to answer this one!!
dot-dot-dot dash-dash-dash dot-dot-dot
Because it was invented by the Germans, it did not mean anything in English.