Definition of "signet"

signet

/ˈsɪɡ.nɪt/

noun
plural signets
1. (historical) An object (especially a ring) formerly used to impress a picture into the sealing wax of a document as a proof of its origin.
  Quotations
  I had my fathers Signet in my Purse, / Which was the Modell of that Danish Seale:
  c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene ii]
  To carry pure death in an earring, a casket,A signet, a fan-mount, a filigree basket!
  1844, Robert Browning, The Labratory