Glider (Conway's Game of Life)
The Glider is a proposal for a Hacker Emblem by Eric S. Raymond. If you are courios reade the faq.
The glider is an appropriate emblem on many levels. Start with history: the Game of Life was first publicly described in Scientific American in 1970. It was born at almost the same time as the Internet and Unix. It has fascinated hackers ever since.