In Cash Games (excluding AoF) and Tournaments, the icon will display a player's current VPIP percentage. VPIP stands for voluntarily put money in pot. In other words, this stat shows the percentage of time a player calls or raises pre-flop. Players will be able to view other players percentage, and other players will be able to view the player's percentage as well.
​Note:

1. For cash games, only the last 50 hands of the specific table are used to calculate the VPIP%.

2. All data is based on specific table & tournament session data except Rush & Cash.
3. The session of Rush & Cash is combined across all tables.

The heat index indicates how much a player is up the current session, should go a long way towards providing a clearer picture of a player's win/loss and current mindset. For instance, if a player is having a Blazing Run, it means he's up at least 200 BBs in the current session.