What is the difference between the AAA / AAAA golf balls? Is there such thing as golf balls AAAAA?

Im so confused .. help someone?

Each recycled (used) golf ball retailer \ distributor uses its own rating system, there are no rules to regulate quality used balls courses. Most of these companies provide a guide to quality \ long balls in each class of its classification system, should use this guide or contact contact the company for more information.

GOLF BALLS AAA Grade Mixed Model Go To http://www.golfclubtowel.com/balls

Titleist Pro V1 Pearl / AAA Golf Balls with FREE Sherpashaw Ball Marker £16.95 …

Callaway Mixed Pearl / AAA Golf Balls with FREE Sherpashaw Ball Marker £8.95 …

Titleist NXT Pearl / AAA Golf Balls with FREE Sherpashaw Ball Marker £10.49 …