T-wall
n.— «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 concrete—”Texas barriers” or “T-walls,” in U.S. military parlance.» —“ Samarra Rises” by Joshua Hammer Smithsonian January, 2009. (source: Double-Tongued Dictionary)
Further reading
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