The SMBIOS spec lists Pizza Box (05h) and Lunch Box (10h) as the meaning for System Enclosure or Chassis Types. The other stuff makes sense but these do not. Are there really chassis types that corresponds to these types? If so, could someone please point out examples for them.
They probably refer to the form factors used by workstations of yesteryear such as the Sun SPARCstation line. "Pizza boxes" were flat and squareish and "lunch boxes" were small, squat, and about the size of the metal lunch boxes used by schoolkids in the U.S. from the 60's to the 80's. I dimly recall external drive enclosures being called "shoeboxes".
Both are actually desktop form factors. The pizza box happens to be ~1U in height, but is -not- the same form factor as a a modern 1U server. The lunchbox is, as mentioned above, akin to the shape of a child's metal lunchbox (but does not share its dimensions).
These are the classic examples of both form factors -
As several people noted, "Pizza Box" refers to a 1U server.
"Lunch Box" refers to a portable computer inside a transportable case vaguely resembling a child's lunch box. This type of computer usually has a keyboard and display that pop out of the case somehow. These are typically used in military applications.