Ключевые слова: aged, background, biohazard, blue, care, caution, chemical, container, corrosive, danger, decay, diamond, diamond shape, door, dot, enter, firefighting safety, flame, flammability, flammable, guidance, hazard, hazardous, hazardous material, hazardous materials placards, hazmat, health, industrial, industry, informing, label, laboratory, nfpa, notice, placard, propane, radiation, reactivity, red, research, risk, room, safety, sign, space, steel, symbol, tank, warning, yellow,