Ключевые слова: abort, access, accessibility, attention, ban, barricade, barrier, block, border, caution, concept, danger, design, error, finger, forbidden, frame, gesture, hand, human, icon, impediment, no entry, obstacle, obstruction, outdoors, palm, permission, please, prohibition, protection, red, reject, risk, roadblock, round, safety, security, sign, stop, symbol, terminate, traffic, warning, wooden fence,