Ключевые слова: app, application, building, business, chimney, collection, computer, concept, construction, crane, ecology, element, energy, factory, gas, gasoline, heavy, helmet, icon, industrial, industry, iron, isolated, line, manufacture, mechanical, metallurgy, oil, petrochemical, petrol, pictogram, plant, pollution, power, production, set, silhouette, structure, symbol, technology, tool, tower, transportation, warehouse, workshop,