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Wiktionary
geek code

n. A set of codes commonly used in sigblocks to broadcast the interests, skills, and aspirations of the poster.

Wikipedia
Geek Code

The Geek Code is a series of letters and symbols used by self-described " geeks" to inform fellow geeks about their personality, appearance, interests, skills, and opinions. The idea is that everything that makes a geek individual and different from all the other geeks in the world can be written down ( encoded) in this very compact format. Then other geeks can read the geek code and work back from that to discover what the writer looks like, what interests they have, and so forth. This is deemed to be efficient in some sufficiently geeky manner.

Once created, geeks can use their geek codes anywhere they please. Geek codes are known to be used on emails, Usenet posts, websites, letters, art, programming language comments, and even T-shirts. Nowadays, personal websites are the most common area, particularly "about me" sections.