I found yur carping about people not doing research before referring the question to the forum distateful, but your reference to Wikipaedia very informative. So you got one vote for GA and one vote OT from me.
Please dont scare off people with such "holier than thou comment" as above. I for one learn something about anisotropy (especially of machined surfaces) which I will find interesting and useful, and for which I would not have learnt if the original question were not asked. So you never know who will benefit from the simplest of questions!!!
If you have looked it up you've got the answer; if not, here is a rough definition. Most machined surfaces have a lay, the direction the cutting tool was traveling in. Easily spotted when sanding, milling or turning a part on a lathe. The surface you are looking to achieve has no discernable pattern or direction, similiar to a lapped surface. Very uniform overall. Many ways to achieve this including technologies I haven't yet used. Are you looking to increase lubricity between dynamic surfaces?