From APB:Reloaded Wiki
The Reputation Meter marked with a red circle.
Rating in APB shows your current level of progression through the game.
At the moment, 235 is equal to 100% completion.
Rating is comparable to "levels" in other MMO games.
Depending on your rating, your icon will change (every 10 levels), until rank 235, which will be the last change of the icon.
Rating can be earned by completing missions, advancing Roles and leveling up your standing with Contacts.
What requires Rating?
Most items in APB, like Clothing and Vehicles, have a minimum rating requirement; even the ones that you buy from Armas.