Well, the idea Track and Motiv share is trying to provide the average bowler with simple tools to determine what ball will best fit their game.
The first letter indicates the CORE. Each core is quite distinct from the others and serves a unique purpose.
The second letter indicates the COVER. There are currently three shells and they vary in texture, absorbtion, etc.
The number tells you the number of times that core has been used at the introduction of that piece.
For example: SR2 is the second ball with the Sigma core and it uses the Motivat-R cover.
If a bowler decides to drill multiple Motiv balls, they will know what they are getting far better than people buying balls with random names.