Rota (papal signature)
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The rota is one of the symbols used in the papal signature, found on papal bulls, composed of a cross inscribed in two concentric circles, first used by Pope Paschal II.
The four inner quadrants contain: "Petrus," "Paulus," the pope's name, and the pope's ordinal number. The current pope's motto surrounds the outer circle. The inside of the outer circle sometimes contains the pope's autograph.