what does esp mean?

title says it all, what does esp mean?

with [ESP], you get to see the player names on both your team and the opposite team. Which will allow you to see where they are and where they go.

Trivia : The name originates from a wallhack in other games where the names or position were shown in the players field of vision, regardless of line of sight negating walls, effects etc. It also goes hand in hand with another abbreviation: Extra Sensory Perception, where a person can 'feel' a presence.