Cynically: "Market speak".
Here is a starter reference:
https://wiki.archlinux.org/index.php/Mouse_polling_rate
And more specifically with regards to your post:
http://support.razerzone.com/gaming-mice-and-mats/tron-gaming-mouse-designed-by-razer/
Note the 3rd paragraph regarding polling rate.
Makes it all sound faster and more technical and likely impossible for the end user to truly quantify things.
Probably determined in ideal circumstances.
For the most part, you will probably just have to experiment and work out what rate fits your gaming needs.
Does not necessarily have to be the highest polling rate possible....