The ring and the staff, symbols used in the investiture of a bishop.
Definition of Annulus Et Baculus
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd Edition(Lat ring and staff.) The investiture of a bishop was per annutum et baculum, by the prince's delivering to the prelate a ring and pastoral staff or erozier. 1 Bl. Comm. 378; Spelman.