Quote Originally Posted by Jazz_Luvr View Post
It's to quote multiple posts.

When you click on it, it puts a check mark next to the post. Then when you Reply with Quote, all of the ones that are checked are quoted in your reply.
yeah that's handy

But is there a way to undo it?

It works well when you use it, but if you come back to the same thread later then hit "reply with quote" on a new post, you get all of the posts you quoted in your reply box (again)