Ключевые слова: abstract, black, board, browser, business, cable, check, checklist, checkmark, clipboard, design, document, ecology, editable, element, file, filled, flat, folder, free, graphic, hierarchical, hierarchy, home, icon, illustration, internet, isolated, leaves, linear, list, media, mobile, money, nature, network, note, paper, share, sign, social, structure, symbol, technology, transparent, travel, usb, web, website,