Sawing is a method of torture and execution.
The condemned was hung upside down and then sawed apart down the middle, starting at the groin. Since the condemned was hanging upside-down, the brain received a continuous blood supply in spite of the severe bleeding. The condemned would remain completely conscious until the saw severed the major blood vessels of the abdomen, and sometimes even longer. In Asian countries, the condemned stood up while constrained and sawing started at the head. According to some religious histories, the prophet Isaiah was executed in this manner. (via Sawing (torture) - Wikipedia, the free encyclopedia