The Major System is a Mnemonic technique for Memorising Number Sequences using sounds. Article 
It's easiest to think about this in the context of the International Phonetic Alphabet because you end up using phonetic substitution
Major SystemThe Major System is a Mnemonic technique for Memorising Number Sequences using sounds. Article
It's easiest to think about this in the context of the International Phonetic Alphabet because you end up using phonetic substitution