Number Stations are mysterious radio stations that transmit a transcript of numbers (alphabetically or in words). Their reason for existence is not clear as no official source has stated their purpose. Apparently, number stations messages are encrypted and can only be deciphered if the listener has the proper "key". At least in one known case, a number station was related to Cuban spying network that was caught and sentenced in the US.
- Some theorize that number stations were used to transfer encrypted messages during the Cold War era, and they are still in place for secret communications.
- At least 3 numbers stations were identified and were linked to Israeli, Mossad, MI6, and Cuban intelligence.