(law) A mark or sign that is used to witness and authenticate the signing of an instrument, contract, or other document. A corporation, for example, uses a seal to authenticate its contracts and records of its corporate acts.
(shipping) A small metal strip and lead fastener used for fastening or locking the doors of a container, which is usually numbered and which provides proof that a container has not been opened since the seal was applied.
(U.S. Customs) Effective October 15, 2008, U.S. Customs and Border Protection (CBP) will require that maritime containers in transit to the U.S. by vessel be sealed with a seal meeting the ISO/PAS 17712 Standard (International Organization for Standardization/Publicly Available Specification 17712). In addition, container seal numbers must be transmitted to CBP via the Vessel Automated Manifest System (AMS) a minimum of 24 hours before cargo is laden aboard a vessel at a foreign port.