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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.
The letters L.S., an abbreviation for the Latin phrase locus sigilli, meaning the place of the seal, can also be used in place of a material seal, as can the word seal or a statement to the effect that the document is to take effect as a sealed instrument.