Index icons:

IndexIcon
1-10
10-25
25-45
45-70
70-100
100-140
140-200
200-300
300-400
400+


Index is calculated as follows:

Index = (WinRatio)*(Average Opponents Per Game)*(Aggressiveness Factor)*(PointsPerGame)*(Exposure)
Aggressiveness Factor
Aggressiveness Factor is calculated as follows:
0.6 + 0.3 * (Kills Per Game / Maximum(Kills Per Game)) + 0.1 * (Territories Per Game / Maximum(Territories Per Game))

Exposure
Exposure is calculated as follows:
Unique Opponents / Maximum(Unique Opponents)