UPDATE: This is disabled right now, as it takes quite a lot of firmware space and usefulness is limited (AKA nobody uses this).

Unistroke is a touchscreen text entry method requiring only one stroke per letter. Here is the alphabet reference:

Red is the stroke, the black dot is the stroke's starting point, the gray lines are just there to help learning.

Backspace is a bottom-right to top-left diagonal stroke. Digits are entered with buttons (for now).

The display flashes green when a stroke is recognized otherwise red, and yellow when a character is erased.