This page contains links to various so-called Signature Codes. This is somewhat of a misnomer as many people (such as myself) put their encodings up on their web sites and then just put those in their sigs.
For those of you who don't know what I'm talking about, these codes are a way to have a very large amount of information expressed in a very small space. They kind of look like line noise unless you know what you're looking for, but to someone who understands they say a lot about you.
I also wrote on my own code, The Sex Code. There is a link for another sex code below, but I like mine better (grin).