signoff

noun4

1. •
   The act or process of signing off (approving with a signature).
2. •
   A valediction, such as at the end of a letter or broadcast.

   • Just think of Walter Cronkite's famous signoff for the CBS Evening News—“And that's the way it is”—or the motto of the New York Times—“All the news that's fit to print.” — 2010
3. •
   The process of exiting a computer system; logoff.
4. •
   A bid indicating that one's partner should pass.

   • Jack North then tried for game with two no-trump before respecting his partner’s signoff in three diamonds. — 2009