Cross Reference Index Entry
Ranganathan in his Classified Catalogue Code uses the term, Cross Reference Index Entry for the type of entry that "usually directs the readers attention from one heading to another synonymous one in the Alphabetical Part".
"The purpose of Cross Reference Index Entry is to invite the attention of a reader from the term he brings upto the catalogue to its equivalent term or some other term under which he can find his information. This is because the catalogue uses in all Specific Entries only the term found on the title page and its overflow of the document catalogued".
In the Classified Catalogue, a Cross Reference Index Entry may be one of the following five types:
As stated earlier Ranganathan prefers to use the term Cross Reference Index Entry for an entry provided for one or other of the classes dealt with by a document other than the dominant focus or class.