noun: a device incised to make an impression; used to secure a closing or to authenticate documents
noun: fastener that provides a tight and perfect closure
noun: a stamp affixed to a document (as to attest to its authenticity or to seal it)
As in Seven Seals mentioned in Revelation
See Also
first seal
hermetic seal
Ramsay - Music's Seal - The Number Three
Seal
Seven Seals