"Firesale", as the term is used in this movie, refers to a a three-stage attack on a country's Internet infrastructure, either as a form of jihad or as a preliminary step prior to actual physical attack. One-by-one, each of a nation's various computer systems are selectively shut down. First to go is the transportation system, shutting down traffic signals, aircraft, and trains, resulting in general public chaos. Second to go are systems involving telecommunications (phones, satellites, etc.), financial information, law enforcement, and government agencies. The third step is to shut down all utilities (electricity, gas, water, nuclear and solar energy plants, etc.). The term "firesale" is used because of its previous reference to the sale of goods at extremely discounted prices, usually due to a fire, and to the commercial catchphrase: "Everything must go!"