What are those - - - folders in the "move message to" menu ?

"George Langford, Sc.D." <[email protected]>
Newsgroups gmane.mail.spam.spamcop.email
Message-ID <[email protected]> 
Whenever I'm jockeying around questionable emails in order
to shove 'em out of my Inbox (whence they'll eventually get
POP'd into my 'puter), the menu shows two horizontal dashed
lines, one above and one below the "New Folder" choice.  Are
those just framing that "New Folder" line or is that where
the apocryphal "devnul" is located ?  And which one makes
'em go away the best ?
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