Which of the following is NOT a type of subject heading?

Subject headings are a vital component of library classification and cataloging systems, helping users locate materials based on specific topics, themes, or formats. In this context, the types of subject headings typically utilized in libraries include topical, geographical, and format headings.

Topical headings refer to the subjects of the works and are used to classify materials based on their content. For instance, a book about World War II would have a topical heading related to that historical event. Geographical headings signify the location or place associated with the content of the work. For example, a book discussing the geography of Canada would carry a geographical heading pertaining to Canada.

Format headings categorize materials based on their physical or digital format, distinguishing between things like books, journals, sound recordings, or videos.

Pictorial, however, is not a recognized type of subject heading in traditional library classifications. While illustrative materials may be described or categorized in library catalogs, they do not constitute a formal category of subject heading like the others. Hence, identifying "pictorial" as not being a type of subject heading aligns with the correct understanding of library classification systems. Thus, recognizing the distinctions among the various types of subject headings is crucial for effective information organization and retrieval in libraries.