3 character domain valued at $5300 - I've set the buy it now at just over half that so there's room for you to make money if you want to purchase and flip it.
esp.de sold for over $7,000 back in 2010 for a comparison. (link)
ESP can refer to any of the following:
Email Service Provider
Spanish language (Espanol)
Empirical Study of Programming
Electric Submersible Pump
Quite a few more as well: https://en.wikipedia.org/wiki/ESP