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.
point symmetry
The symmetry group of an object (image, signal, etc., e.g. in 1D, 2D or 3D) is the group of all isometries uner which it is invariant with composition as the operation. It is a subgroup of the isometry group of the space concerned.