Help:Style Guide

Code Blocks
To format code, use the source tag, which provides full syntax highlighting. Specify the language with the lang attribute, or if you don't want it to highlight syntax, use "text".

"python", "text", and "javascript" are the main ones, but all major languages are supported.

Linux Penguin Icons!
They must be holding a webOS device (unless they are for another purpose, chat etc). If your page could use a linux penguin (only for Linux related articles sorry), feel free to use the template and one of the many Penguins. Template:Tux