Unno what exactly its stands for.
But its shows player tags(play names)
And there distances from you.
ESP
Extrasensory perception (ESP) in video games displays contextual information such as the health, name, equipment, position and/or orientation of other participants as navigation/directional markers. In military parlance, this is known as Battlefield Visualization and part of a larger trend toward Information Dominance.
Here is an example
[IMG]https://i88.photobucke*****m/albums/k185/3D-n1nj4/Crossfire20090614_0000.jpg[/IMG]