Concurrent players, which is essentially how many people are playing the game at the same time.
There are two different numbers to consider when looking at player numbers on Fortnite. Compare that to the $500 million or so that other parts of the business generated in a similar time frame, and you see just what a phenomenon Fortnite really is. In 20, Fortnite generated over $9 billion in revenue, while in 2020 it added a further $5.1 billion. To say it has been lucrative for Epic would be an understatement.