embolus

noun embolus

• barrier — A barrier is something such as a rule, law, or policy that makes it difficult or impossible for something to happen or be achieved.
• barricade — A barricade is a line of vehicles or other objects placed across a road or open space to stop people getting past, for example during street fighting or as a protest.
• closure — The closure of a place such as a business or factory is the permanent ending of the work or activity there.
• restriction — something that restricts; a restrictive condition or regulation; limitation.
• roadblock — an obstruction placed across a road, especially of barricades or police cars, for halting or hindering traffic, as to facilitate the capture of a pursued car or inspection for safety violations.