It was invented by Heartstopper Necrolyte. It was a substitution cipher in which each letter of the alphabet is substituted with a two digit or charactered numbers and letters.
A-10
B-11
C-12
D-13
E-14
F-A1
G-A2
H-A3
I-A4
J-A5
K-B1
L-B2
M-B3
N-B4
O-B5
P-C1
Q-C2
R-C3
S-C4
T-C5
U-AA
V-BB
W-CC
X-DD
Y-EE
Z- FFNO SPECIFIC SEPARATORS
~~~CTTRO
![](https://img.wattpad.com/cover/242426647-288-k229015.jpg)