ELI5: Explain Like I'm 5

Tap code

Tap code is a way of communicating by tapping. It is like Morse code, but instead of using sound, it uses taps. To use tap code, you tap different patterns on a surface. The patterns represent different letters or numbers. To tap out a word or a phrase, you tap the pattern for each letter in the word one by one. To help you remember the pattern, here is a code chart:

1 tap - E
2 taps - T
3 taps - A
4 taps - O
5 taps - I

Now, let's say you wanted to spell the word 'EAT'. To do this you would tap the pattern "12-3" on the surface. That would spell the word EAT. You can also use tap code to send numbers. To do this, you just use the letters A through O, and each letter stands for a number. For example, A is 1, B is 2, C is 3, and so on. So if you wanted to spell the number 123, you would tap "A-B-C".