@cbae: No, that's the pinned shortcut area of the Start Menu. The Start Menu is everything that shows up in that rectangle that appears when you click the Start button (or Orb or Pearl or whatever they were calling it last)
You can call it what you want, but the behavior of "Pin to Start Menu" and the label of the menu option suggest that the Start Menu is ONLY the area that you want to call the "pinned shortcut area of the Start Menu".
If you are going to arbitrarily define the "Start Menu" as "everything that renders within the rectangle when you click the Start Button", then we can say that the "Start Menu" in Windows 8 includes the tile screen, the tile group organizer screen, the All Apps screen, the search screen, and any dialog that shows when you click a "charm". Fine.