yes, that's a custom bit of markup.
basically using:
Puts it into a pre html mode with a console font so the ascii art and what not shows up. It also allows you to process and add links that are clickable / smileys etc.
Using such a mode as [code] would be a very bad idea as you can easily wreck a layout of the forum, have links inside code (the whole point is so you can not process markup inside code tags), etc. so we stuck it in as a new function.
So there's three:
[quote]
That's marked up, but not formatted
[code]
for instances when you don't want the forum to markup and text will appear exactly as you want
[nfo]
Is a terminal font, and no word wrapping ala. nfo file compatible... so be careful with the line length, etc. if your not pasting in nfo files.
I use nfo for specs too