The Major System: Encode Numbers as Words

Phonetic encoding, word images, and the PAO system — building number memory from scratch

What is the major system, and how do you use it to memorize numbers?

The Major System is a phonetic mnemonic that assigns consonant sounds to digits 0–9, letting you convert any number into a pronounceable word or phrase. Those words are far easier to remember than raw digits because the brain handles language and imagery dramatically better than abstract numerals. The system is well established among memory practitioners, though formal RCT evidence is limited.

Humans are terrible at remembering strings of digits and excellent at remembering stories, faces, and places. The Major System bridges that gap by converting numbers into consonants, consonants into words, and words into images — which can then be placed in a memory palace or linked in a story. The system dates at least to the 17th century and has been refined and used by memory champions ever since. Below are the core practices that make it work, with honest evidence ratings.