It's a boon that every internet company, and venture capital firm, has ambitions to build a social network site. If only because it means the executives feel obliged to create their own personal pages. Sergey Brin's profile on Orkut — the also-ran social network owned by Google — is ever so slightly creepy. For those who fear Google's grid will one day attain consciousness, and turn on its makers, the Google founder's membership of the Transhumanists, a group within Orkut, will no doubt confirm their paranoia. And Brin displays, as his icon, not his unthreatening mug, but this strange symbol. Any idea what it represents? Your guesses, after the jump.