Audit Signet
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A brass signet cut from the Auditor's seal: the three-faced dome of the Sum on the bezel, tally notches round the band. It counts your blows as the Auditor counted the loops — and every fifth one sums the count.
In the Codex
Entry 
The Auditor — In the Summing Hall of the Heart a great automaton sits over the book of the Sum. Read the Auditor — or an Audit Seal.