Third or tertiary radical of a (possibly noncommutative) unital ring has been studied in
where the tertiary decomposition theory has been introduced.
See also
Gerhard Michler, Goldman’s primary decomposition and the tertiary decomposition, J. Algebra 16, 1970 129–137 MR268218 doi A generalization of tertiary decomposition theory to a class of Grothendieck categories is in
Nicolae Popescu, An introduction to Abelian categories with applications to rings and modules, Acad. Press 1973
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