Use of numbers to interpret a person's character or divine the future.
It is based on the assertion by Pythagoras that all things can be expressed in numerical terms because they are ultimately reducible to numbers. Using a method analogous to that of the Greek and Hebrew alphabets (in which each letter also represented a number), modern numerology attaches a series of digits to an inquirer's name and uses these, along with the date of birth, to reveal the person's true nature and prospects.