Ключевые слова: abstract, background, black, brass, business, chain, chrome, clo, close, concept, cross, equipment, gold, guard, icon, iron, key, link, lock, macro, master, metal, metallic, object, old, open, padlock, protect, protection, real, ring, round, safe, safeguard, safety, secure, security, shape, silver, single, solid, steel, stop, strength, strong, symbol, unlock, vintage,