What term refers to the physical barriers to access on a ship?

The term that accurately refers to the physical barriers to access on a ship is "Access Control Measures." These measures are put in place to manage who can enter certain areas of the vessel, which is crucial for maintaining security and safety onboard. Access control can include physical barriers such as gates, doors, or security systems that restrict entry to sensitive areas, ensuring that only authorized personnel can access specific zones of the ship.

Understanding access control measures is essential, especially in maintaining the safety protocols required on maritime vessels, where unauthorized access to certain areas could lead to safety hazards or security breaches. This terminology reflects the broader strategy of protecting various parts of the ship to ensure compliance with safety regulations and operational efficiency.