Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
sgn
In mathematics, the sign function is a mathematical function that extracts the sign of a real number. To avoi confusion with the sine function, this function is often called the signum function (after the Latin form of "sign").