It means that when your selecting your focus point, you can go to the farthest right point, and click again, and it will jump to the other side. I was confused at first too and looked in the manual.
Many people don't use it on the D200 because they don't know what it does, but it's a manual loaded into the firmware which gives exactly definitions like this.
Thank you antithesis..i get it a little bit , but will have to search up on it more...and yes, it does have a question mark, but it wasnt too much of an explanation for me...I need to read some more on it..Thank youuu