There actually is a reasonably interesting story about them: http://www.americanscientist.org/issues/pub/2011/4/a-round-pie-in-a-square-box/1 http://www.america

There actually is a reasonably interesting story about them: http://www.americanscientist.org/issues/pub/2011/4/a-round-pie-in-a-square-box/1 http://www.americanscientist.org/issues/pub/2011/4/a-round-p... And the word you're looking for is "pizza saver".