Mental Floss: SOS – What Does SOS Stand For? – Background info about the SOS code and how it became an international code.
BoatSaftey: SOS – What is the Meaning of SOS? – A marine perspective of what the SOS code means.
Wikipedia: SOS – Information about the international Morse Code distress signal. Offers an example.
The following video offers a 1 minute demonstration of a SOS Morse Code sound effect.
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