(n.) A seal; especially, in England, the seal used by the sovereign in sealing private letters and grants that pass by bill under the sign manual; -- called also privy signet.

John Hancock OK X acceptance affirmance affirmation approbation approval authentication authorization autograph billhead book stamp bookplate boss brand broad arrow bump cachet cap of dignity cap of maintenance certification check christcross cipher colophon concavity confirmation convexity coronet counterfoil countermark countersign countersignature counterstamp cross crown dactylogram dactylograph dent device diadem dint docket embossment endorsement ermine excrescence fingerprint footmark footprint footstep fossil footprint go-ahead government mark government stamp great seal green light hallmark hand ichnite ichnolite impress impression imprimatur imprint indent indentation indention initials label letterhead logo logotype lump mark mark of signature masthead monogram nod notarization okay orb pad paw print pawmark permission pimple plate price tag print privy seal pug pugmark purple purple pall ratification regalia registered trademark robe of state rod rod of empire royal crown rubber stamp running head running title sanction scepter seal sigil sign manual signature stamp stamp of approval step sticker stub stud subscription tag tally the nod thumbmark thumbprint tiara ticket title page token trade name trademark trademark name triple plume uraeus validation vestige visa vise warrant