cross-reference

A cross-reference is a notation or direction within a document, such as a book or filing system, that points the reader to related information located elsewhere within the same document or a related one. This allows for the organization and verification of information by connecting different parts of a text.12

For example, a footnote might direct you to a glossary at the back of a book, or an almanac might include cross-references to maps and timelines for specific entries. The term can be used as both a noun and a verb, referring to the notation itself or the act of creating or using such notations.3421