T-wall
n.β Β«I pass the ruins of police headquarters, blown up by an Al Qaeda in Iraq suicide truck bomber in May 2007, and enter a corridor lined by eight-foot-high slabs of concreteβ”Texas barriers” or “T-walls,” in U.S. military parlance.Β» ββ Samarra Rises” by Joshua Hammer Smithsonian January, 2009. (source: Double-Tongued Dictionary)