Numbers station
▻http://en.wikipedia.org/wiki/Numbers_station
A numbers station (or number station) is a type of shortwave radio station characterized by their unusual broadcasts, which consist of spoken words, but mostly numbers, often created by artificially generated voices reading streams of numbers, words, letters, tunes or Morse code. They are transmitted in a wide variety of languages and the voices are usually female, although sometimes men’s or children’s voices are used.
je vais pas parler du #film qui est une sorte d’Ennemi d’Etat à huis clos ; mais la page wikipédia est drôlement intéressante