white space
n.β Β«Controlling white space, a military term for areas that warfighters don’t physically occupy, is another revolutionizing trend, Ozolek said. For example, GPS-directed unmanned vehicles patrol where soldiers cannot.Β» ββ4 ways tech changed the fight” by Josh Rogin FCW.com (Falls Church, Virginia) Feb. 12, 2007. (source: Double-Tongued Dictionary)