A logo for my T-shirt?

Planning to construct a logo for a T-shirt has been on my mind for some time now. It should look neat, but be practical at the same time. What I am certain of at the moment, is that the design ought to include program source code or ASCII art of some sort. License will be GPL of course ;->

In both cases, the number of characters should be minimal. I'm thinking along the lines of a few hundred bytes or so, and about six or seven lines of code. Readability is at paramount: a well educated person if mathematics, information technology or engineering ought to understand it in a minute.

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