An index is a descriptive title for an image, a figure, or a table.

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An index is a list of words or phrases ('headings') and associated pointers ('locators') to where useful material relating to that heading can be found in a document or collection of documents. Examples include a book index, a subject index, a personal name index, etc. It is not a descriptive title for an image, figure, or table; those are typically referred to as captions or titles.

An Index Is a Descriptive Title for an Image, a Figure