#5 The Dominic System or P-A-O method
The P-A-O or Person-Action-Object method was developed by eight-time World Memory Champion Dominic O’Brien. It works by converting a letter of the alphabet into a number. That means 0 = O, 1 = A, 2 = B, 3 = C, 4 = D, 5 = E, 6 = S, 7 = G, 8 = H, 9 = N.
We then create a sentence where the first letter of the word indicates the digit. For example, the sentence: A Brown Cat Driving A Green Car translates to 2,345,284. The Dominic System is used to help us remember extremely long numbers.