BB code is the language VBulletin (this forum's software) uses to modify the formatting of text, insert outside images or videos, etc. I've been using this for a bit but those who are unaware of how the BB code works there's a quick cheat sheet that will make using the forums a bit easier that you can find in our FAQ here:
http://www.tetongravity.com/forums/misc.php?do=bbcode
