The "new" symbol appears if you haven't read the post, and is individual to each user.  If you wrote the post, it won't appear to you (you wrote it so you must have read it I guess).  To everyone else on the forum the "new" symbol will appear until they read the post.

Hey Tom, I have all 4 doors in excellent condition with electric windows. Call me on 0438909313 to talk price. I also have the matching roof liner and various giulli bits and peices