Ключевые слова: 3d, abstract, attention, background, beware, black, board, business, careful, caution, communication, concept, danger, defective, design, down, feeling, graphic, icon, illustration, information, isolated, lettering, lock, lockdown, message, object, office, panel, plate, quarantine, rendering, risk, safety, security, service, shut, signal, signboard, signed, symbol, symbols, table, tapes, text, warning, word, working, yellow, zone,