Ключевые слова: abstract, again, application, arrow, back, backstep, button, change, circle, clipart, communication, concept, design, element, flat, graphic, gray, icon, illustration, internet, left, marker, music, operation, page, panel, progres, push, refresh, reload, replay, reset, restart, restore, rewind, rotate, rotation, round, set, sign, symbol, technology, template, undo, web, website, white,