Sensei's Autograph is a background in Club Penguin. You could receive it my meeting Sensei in July 2009, September 2009, November 2009 or in November 2010. Sensei, holding Card-Jitsu Cards, is in the front of the Dojo Courtyard as seen in the background. Its Item ID is 9036.
Sensei's Autograph was first released in July 2009. It then came back in September 2009. Then it came back in November 2009, 2010, and 2011.
* Unlike everyone except Rocky and CeCe's Giveaway his autographed background has never changed.