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The acronym SEAL in the United States Navy SEALs stands for Sea, Air, and Land. It is derived from the teams' ability to operate on the seas, in the air, and on land.
Seal. To close records by any type of fastening that must be broken before access can be obtained. An impression upon wax, wafer, or some other substance capable of being impressed. The use of seals began at a time when writing was not common, but when every person of means possessed a coat-of-arms or other distinctive device.