Some time after World War II (if not earlier), shortwave radiobroadcasts started appearing with no obvious purpose. A synthesized voice, usually female-sounding, would read out a list of numbers or seemingly random words, sometimes accompanied by morse code with a nonsensical translation. It is widely assumed that the stations are used in spycraft, but no country or intelligence agency has ever admitted to being the source, and their true function remains unknown.
Read more at :
http://www.avclub.com/article/explore-century-old-mystery-numbers-stations-207413
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