Narrower Term (NT)
|Mandatory||Repeatable||Data Type||Authority||Public Element|
|No||Yes||Variable Character Length (700)||Topical Subject Thesaurus, Geographic Reference Thesaurus, Specific Records Type Thesaurus, and Program Area Thesaurus||Yes|
An authorized, preferred heading that is narrower in definition and scope.
Supports the hierarchical relationship between or among headings in a controlled vocabulary.
Supports the primary purpose of vocabulary control to achieve consistency in description and to facilitate retrieval based on the hierarchical relationship of concepts.
For cataloging narrower term reference headings, see the Subject Cataloging Manual: Subject Headings (Library of Congress).