Numbers stations are / were spooky shortwave radio stations, best known from the Cold War, which broadcast human voices reading numbers, usually in groups of five. It’s widely assumed these were / are used by many nations for communicating with secret agents in foreign countries, using an unbreakable one-time pad cipher.
You can spook yourself by listening to The Conet Project.
Or you can code a BBC micro:bit to be come your very own numbers station!
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