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Barbed wire is used as a security measure to prevent intruders from entering private property or restricted areas. The barbed wire in the picture is installed on top of a concrete wall.
No unauthorized entry sign. Vector illustration of red crossed out circular sign with screaming man with hand stopping. No access prohibition symbol. No entry. Do not touch.
ilustration of symbols of restricted area which are in under construction
Sign with the german inscription Sperrbezirk Geflügelpest. Translation: Restricted area, avian influenza, no entry
A line of buoys marks a restricted area of a coral reef in Egypt, floating on calm water and creating a clear boundary along the shoreline.

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