Picture of a park's no entry sign

Quick answer：

This refers to a visual representation of a sign that prohibits entry to a park. Such signs typically feature a red circle with a slash through a walking figure or a vehicle, indicating that entry is restricted. These signs are used to maintain public safety, preserve the natural environment, or for other administrative reasons. In the context of a park, such signs might be placed at the entrance to prevent unauthorized access, protect wildlife, or due to maintenance or closure periods.