What's this mean?

[PShabi]

It's usually listed VP$IP, PFR, and the 3rd # is postflop aggression factor, 2 being the "average correct" value for this.

If you see a 4th value, it's usually referring to the # of hands in the sample size.

Shabi is 24/18/2.4/150 for example

is 24% VPIP
18% PFR
2.4 Agg factor
thru 150 hands.