Signet /(?)/

Sig·net

Signet

n.
  1. 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.
    I had my father's signet in my purse.

Phrases & Compounds
Signet ring
a ring containing a signet or private seal.
Writer to the signet
a judicial officer who prepares warrants, writs, etc.; originally, a clerk in the office of the secretary of state.