Ключевые слова: a helping hand, abstract, alarm, backgrounds, bell, blank, business, colors, communication, computer icon, concepts, connection, control, danger, design, equipment, fire natural phenomenon, flare stack, glass material, heat temperature, help a single word, human finger, human hand, illustration, internet, isolated, key, light natural phenomenon, metal, off, power, push button, pushing, red, reflection, security, service, shape, sign, single object, stop single word, symbol, technology, urgency,