[BRAVESaj25bd8]

This stands for Ranking Score, the average number of ranking points a team earns in a match. Each match the winning alliance receives the losing alliance's score pre-penalties as their ranking score for the match. The losing alliance receives their own score post-penalties as their ranking score for the match. In a tie, each alliance receives the score of their alliance post-penalties. The exception to this is when a team is disqualified from a match, in that case they receive zero ranking points. It's in the manual somewhere but I tought it would be more helpful to just explain.