Tap code
Encoding for text messages / From Wikipedia, the free encyclopedia
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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.[1]
1 | 2 | 3 | 4 | 5 | |
---|---|---|---|---|---|
1 | A | B | C/K | D | E |
2 | F | G | H | I | J |
3 | L | M | N | O | P |
4 | Q | R | S | T | U |
5 | V | W | X | Y | Z |
The tap code has been commonly used by prisoners to communicate with each other. The method of communicating is usually by tapping either the metal bars, pipes or the walls inside a cell.