Abstract: A wind-articulated, warning sign system responsive to oblique wind currents acting external to surfaces of its exposed, non-flat-sheet and non-fabric structural elements and which provides a functional-airfoil-cross-section with surface configured to display and provide emergency critical technical data for specific classes of regular and emergency visitors to the entrance portal of an industrial site where large quantities of dangerous substances, including, radioactive, flammable, explosive, corrosive, oxidizing, asphyxiating, biohazardous, toxic, pathogenic, or allergenic substances are handled and which substances might be released by accident or by terrorist attack and dispersed by winds into the local environment.

Abstract: A wind-articulated, warning sign system responsive to oblique wind currents acting external to surfaces of its exposed, non-flat-sheet and non-fabric structural elements and which provides a functional-airfoil-cross-section with surface configured to display and provide emergency critical technical data for specific classes of regular and emergency visitors to the entrance portal of an industrial site where large quantities of dangerous substances, including, radioactive, flammable, explosive, corrosive, oxidizing, asphyxiating, biohazardous, toxic, pathogenic, or allergenic substances are handled and which substances might be released by accident or by terrorist attack and dispersed by winds into the local environment.