Ключевые слова: attention, bad, block, business, cigarette, communication, concept, conceptual, control, danger, design, direction, forbidden, hand, idea, image, information, isolated, letter, message, no, note, object, octagon, person, post, prevention, problem, prohibition, protection, quit, red, risk, road, rule, safety, security, sign, signal, smoke, stop, symbol, text, traffic, transportation, violence, warning, white, word,