Numbers stations are shortwave radio stations of uncertain origin. They generally broadcast artificially generated voices reading streams of numbers, words, letters, tunes or Morse code. They are in a wide variety of languages and the voices are usually female, though sometimes male or children's voices are used. Evidence supports popular assumptions that the broadcasts are used to send messages to spies. This usage has not been publicly acknowledged by any government that may operate a numbers station, but in 2001, the United States tried the Cuban Five, a group of individuals, with spying for Cuba; they had received and decoded messages that had been broadcast from a Cuban numbers station.

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