Because relations arise in many scientific disciplines, as well as in many branches of mathematics and logic, there is considerable variation in terminology. Aside from the set-theoretic extension of a relational concept or term, the term "relation" can also be used to refer to the corresponding logical entity, either the logical comprehension, which is the totality of intensions or abstract properties shared by all elements in the relation, or else the symbols denoting these elements and intensions. Further, some writers of the latter persuasion introduce terms with more concrete connotations (such as "relational structure" for the set-theoretic extension of a given relational concept).
Because relations arise in many scientific disciplines as well as in many branches of mathematics and logic there is considerable variation in terminology Aside from the set-theoretic extension of a relational concept or term the term "relation" can also be used to refer to the corresponding logical entity either the logical comprehension which is the totality of intensions or abstract properties shared by all elements in the relation or else the symbols denoting these elements and intensions Further some writers of the latter persuasion introduce terms with more concrete connotations (such as "relational structure" for the set-theoretic extension of a given relational concept)