unconventional warfare

used to secure a closing or to authenticate documents n the pelt or fur (especially the underfur) of a seal n a member of a Naval Special Warfare unit who is trained for unconventional warfare n a stamp affixed to a document (as to attest to its authenticity or to seal it) n an indication of approved or superior status n a finishing coat applied to exclude moisture n fastener that provides a tight and perfect closure n any of numerous marine mammals that come on shore to breed