Numerology appears in the belief systems of many different cultures and faiths throughout the world, including Judaism (via Kabbalah).  Its application relies on a scientifically maintained set of rules which governs the mathematical processes used to obtain a numerical sum of esoteric significance, and it is very closely related to modern-day cryptographic science.

The most common schemes are by far the simpler ones which designate an ordinal progression of values to alphabetic characters, such as the values listed below:

A=01 J=10 S=19
B=02 K=11 T=20
C=03 L=12 U=21
D=04 M=13 V=22
E=05 N=14 W=23
F=06 O=15 X=24
G=07 P=16 Y=25
H=08 Q=17 Z=26
I=09 R=18  


Other schemes tend to be more complex, such as the one below, displaying a logarithmic progression:

A=001 J=010 S=100
B=002 K=020 T=200
C=003 L=030 U=300
D=004 M=040 V=400
E=005 N=050 W=500
F=006 O=060 X=600
G=007 P=070 Y=700
H=008 Q=080 Z=800
I=009 R=090  


Other numerological systems impart seemingly random or secret numerical values to the characters of the alphabet.  These values may be based on some hidden understanding of the letters to which they are assigned, such as in the renowned Pigpen Cipher:

ABC DEF GHI
JKL MNO PQR
STU VWX YZ.


In the Pigpen Cipher, the numerical values assigned to the letters of the alphabet are based on a two-digit code, which indicates the order of the letter within the cell (0-2) by the first digit, and the number of the cell with the second digit (1-9).  The complete list of letter values for this scheme is given below:

A=01 J=04 S=07
B=11 K=14 T=17
C=21 L=24 U=27
D=02 M=05 V=08
E=12 N=15 W=18
F=22 O=25 X=28
G=03 P=06 Y=09
H=13 Q=16 Z=19
I=23 R=26  


These three examples are but the simplest and the most basic examples of numerological schemes among the plethora of cryptic numerical values assigned via various systems.