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We Now Know What SOS Really Stands For

 Nope, it's not "save our ship." Not even close.

~ Readers Digest

“Save Our Ship!”

“Save Our Souls!”

“Save On Socks (at Sal’s Irregular Sock Emporium)!”

These are all things that “SOS,” the international abbreviation for distress, does not stand for. Best known for its appearances in desert island cartoons, maritime movies, and earworms by ABBA and Rihanna, the letters SOS have been used as a code for emergency since 1905. But what does SOS stand for, actually? The answer, dear readers, is nothing—and that’s exactly why it’s important.

Unlike WD-40, CVS, and TASER, SOS is not even an acronym: It’s a Morse code sequence, deliberately introduced by the German government in a 1905 set of radio regulations to stand out from less important telegraph transmissions. Translated to Morse code, SOS looks like this:

“. . . _ _ _ . . .”

Three dots, three dashes, three dots. At a time when international ships increasingly filled the seas, and Morse code was the only instantaneous way to communicate between them, vessels needed a quick and unmistakable way to signal that trouble was afoot. At first, different nations used different codes. Britain, for example, favored CQD; as the Titanic sunk into the ocean in April 1912, it broadcast a mix of CQD and SOS calls (the resulting confusion helped take CQD out of use for good).

The sequence of triplet dots and dashes proposed by the German government soon became the international favorite for its elegant simplicity. Transmitted without pause and repeated every few seconds, the message of SOS was unmistakable, specifically because it didn’t form any known word or abbreviation.

There was also a visual appeal. While the same series of dots and dashes could also just as easily translate to the Morse code sequences for VTB, SMB, and others, SOS had an instantly-recognizable symmetry. Not only is SOS a palindrome (a word that reads the same backwards and forwards, like civic, deified, and these other everyday palindromes hiding in plain sight) it’s also an ambigram, a word that looks identical whether read upside-down or right-side-up. When carved into a snowbank, say, or spelled out in boulders on a beach, SOS still no looks like SOS no matter which way the rescue chopper approaches.

By 1908, the code we know and love took effect as the official international radio distress signal, and remained that way until 1999, when Morse code was declared all but dead. Today, a ship can signal distress with the touch of a button, the lift of a phone, the launch of a rocket, or—if they’re feeling nostalgic—flashing a good ol’ SOS via light signals across the waves. Remember it fondly, and then memorize these other mnemonic devices that could save your life.

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