According to the June issue of IEEE Spectrum, Fairfax County (and/or Virginia) is known as Silicon Dominion, Silicon Plantaion, and Silicon Seaboard. Having spent a substantial portion of my life in Fairfax, I have never heard any of these terms before. I lived there during the huge technology build-up near Dulles and along the I- 270 corridor. And it's not like I'm totally out of the loop on this kind of thing either. But, much to my surprise, Google yields a large number of hits for each term. Learn something new every day.