Ключевые слова: abstract, acid, advice, advisory, alert, alertness, atomic, attention, background, banner, biohazard, biology, blackboard, blank, board, bomb, bone, careful, caution, chalk, chalkboard, chemical, chemicals, chemistry, construction, contamination, danger, dead, design, destroyed, dirty, distressed, emblem, energy, environment, error, explosive, frame, gamma, garbage, graphic, grunge, harmful, hazard, human, hydrogen, icon, industrial, industry, internet, irritation, isotope, label, landmark, materials, nuclear, oxidising, pattern, precaution, protection, radiate, radiation, radio, radioactive, radioactivity, radioisotope, ray, risk, safety, science, signs, spill, station, substance, symbol, symbols, tag, technology, texture, toxic, traffic, triangle, uranium, warn, warning, yellow,