Ring of the Fisherman Ring of the Fisherman The Ring of the Fisherman (Latin: "Annulus Piscatoris"; Italian: "Anello Piscatorio"), also known as the Piscatory Ring, is an official part of the regalia worn by the Pope, who is head of the Catholic Church and successor of Saint Peter who was a fisherman by trade. It used to feature a bas-relief of Peter fishing from a boat, a symbolism derived from the tradition that the apostles were "fishers of men" (Mark 1:17). The Fisherman's Ring is a signet used until 1842 to seal official documents signed by the Pope. A letter written by Pope Clement
Graded ring The associativity is not important (in fact not used at all) in the definition of a graded ring; hence, the notion applies to a non-associative algebra as well; e.g., one can consider a graded Lie algebra. Let be a graded ring. Elements of any factor formula_4 of the decomposition are called homogeneous elements of degree "n". Every element "a" of "R" may be uniquely written as a sum "a" = "a" + "a" + ... + "a" with all "a" homogeneous elements of distinct "R". These "a" are called the homogeneous components of "a". Some basic properties are: An ideal