There are 8 cut potential cut areas on your key . Each cut is given a number that represents the code for your key
#1 - represents no cut - ie. a flat area
#2 - mid angle cut
#3 - deep cut that almost touches the flange
Your keys code will consist of 8 numbers each representing the angle of cut.
Starting from the end furthest away from the tip. Write down the number of the first angle. No cut is a #1, mid level cut is a #2, #3 will be a cut almost to the center flange. Continue until you get to the tip.
Check a second time - you should have a string of numbers that represents the code that looks like this 2-2-3-1-1-2-3-2 or similar.
Sometimes adjacent angles will be the same and will be represented by two numbers being the same.