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Tap code

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Tap code is a notation created in 1941.

#2990on PLDB 83Years Old
Wikipedia

The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. The tap code has been commonly used by prisoners to communicate with each other. Read more on Wikipedia...


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