What does [B] mean?

[meyumeng]

When I use Player Pick Analytics before start of match, I see there is a Red after my name.
What does it mean, sometimes I also see it after another player‘ name.

 

[zc15]

Melonity thinks that he is Booster (man played bad before and good now)

 

[Prota]

When I use Player Pick Analytics before start of match, I see there is a Red after my name.
What does it mean, sometimes I also see it after another player‘ name.

Greetings , Regarding TO (B) word in player pick analytics means player is marked as booster