Theres are many varients and varieties of nerd, collected here is but a small cross-section of them.
The STOCS Nerd
A modern day variant of the STOCS nerd, though still similar in many ways to their ancestors. Note particularly their sloping gait, slack jawed stare and the anti-social aura of superiority which surrounds them. This lesser spotted variant of nerd is generally best avoided, lest you attract their attention.
Except robby, robby isn't a nerd, i mean look how ninja he looks.