How the tap code works
Go Deeper.
Create an account or log in to save stories.
Like this?
Thanks for liking this story! We have added it to a list of your favorite stories.
Here's how the tap code works. It's based on a 25 letter alphabet, so throw out 'k' and use 'c' for that letter in a word. The remaining 25 letters are arranged in five rows:
a b c d e
f g h i j
l m n o p
q r s t u
v w x y z
The first series of taps signals the row, the second series of taps the position of the letter in that row. So for 'L' Thorsness taps three times (third row), then after a short pause he taps once (first letter in that row). For 'T' he taps four and four (fourth row, fourth letter).
Turn Up Your Support
MPR News helps you turn down the noise and build shared understanding. Turn up your support for this public resource and keep trusted journalism accessible to all.