+"No Entry" denotes a universal **[prohibition](/wiki/prohibition)**, marking a boundary where passage is forbidden. It serves as a clear visual **[barrier](/wiki/barrier)**, often using a red circle with a white bar, to guide movement and ensure safety or privacy.
+## See also
+- [Keep Out](/wiki/keep_out)
+- [Restricted Area](/wiki/restricted_area)
+- [Warning Sign](/wiki/warning_sign)
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