Ключевые слова: abstract, alarm, alert, attention, background, ban, banner, blackboard, blank, board, caution, chalk, chalkboard, communication, danger, debar, design, embar, forbid, forbidden, frame, icon, indication, information, inhibit, interdict, label, mark, no, pattern, prevent, prohibit, prohibited, proscribe, protection, protest, red, reflection, restrict, risk, safety, sign, stop, symbol, tag, texture, warning, white,