A Seal typically refers to a device or mechanism that is used to secure a shipping container, truck trailer, or railcar. The seal is usually made of metal or plastic and has a unique identification number or code printed on it. Seals are used to prevent unauthorized access to the contents of a container or trailer during transport. The seal is applied by the shipper or carrier before the container or trailer is loaded, and is only removed by authorized personnel at the destination.
Source : ChatGPT