The vertical line character (|) is used to split up your UBB Code. It's optional, and if you include it, everything before it will be placed at the beginning of posts, and everything after it will be placed at the end of posts. By not using this character you will merely append posts. I'll explain that in the help section.
I'm working on the ability to include the UBB on submition of forms, but this will require the vertical character. Have to think on it. But I'm working on it, expect version 0.3 by the weekend's end.