The Jargon File (version 4.4.7, 29 Dec 2003):

geek code
 n.

    (also ?Code of the Geeks?). A set of codes commonly used in sig blocks to
    broadcast the interests, skills, and aspirations of the poster. Features a
    G at the left margin followed by numerous letter codes, often suffixed with
    plusses or minuses. Because many net users are involved in computer
    science, the most common prefix is ?GCS?. To see a copy of the current
    code, browse http://www.geekcode.com/. Here is a sample geek code (that of
    Robert Hayden, the code's inventor) from that page:


    -----BEGIN GEEK CODE BLOCK-----
    Version: 3.1
    GED/J d-- s:++>: a- C++(++++)$ ULUO++ P+>+++ L++ !E---- W+(---) N+++
    o+ K+++ w+(---) O- M+$>++ V-- PS++(+++)>$ PE++(+)>$ Y++ PGP++ t- 5+++
    X++ R+++>$ tv+ b+ DI+++ D+++ G+++++>$ e++$>++++ h r-- y+**
    ------END GEEK CODE BLOCK------

    The geek code originated in 1993; it was inspired (according to the
    inventor) by previous ?bear?, ?smurf? and ?twink?
    style-and-sexual-preference codes from lesbian and gay newsgroups. It has
    in turn spawned imitators; there is now even a ?Saturn geek code? for
    owners of the Saturn car. See also geek.