It is used in capital letters to approve the post..sometimes it is used to mark the article in "my comments" to save to read.or keep up with a long thread.
http://www.freerepublic.com/focus/f-news/1569660/posts
How to post a thread and other interesting facts. (Welcome Newbies)
Admin Lecture Series ^ | February 1, 2006 | Olive
Great info for new posters and #56 has a link to lexicon.
hey...thanks! that was really helpful for me:)