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A signet ring was a ring with the mark of an emblem or symbol on one end.

The Doctor kept one signet ring, which he frequently wore in his first incarnation. (TV: An Unearthly Child, et al)

Erimem wore a signet ring with the mark of Sekhmet. (AUDIO: The Bride of Peladon)

The Master had a green signet ring with Gallifreyan writing which was used by the Disciples of Saxon to revive him after his death. (TV: The End of Time)