Ключевые слова: abstract, app, background, black, button, cancel, check, choice, circle, close, computer, concept, cross, decline, delete, denial, deny, design, element, exit, fail, failure, flat, forbidden, graphic, icon, illustration, interface, internet, isolated, key, line, mark, navigation, negative, no, outline, refuse, reject, remove, sign, simple, single, symbol, web, white, wrong, x,