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tryptic

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Triptych online photo

Definition of Triptych

A work consisting of three painted or carved panels that are hinged together.
 Or a hinged writing tablet consisting of three leaves, used in ancient Rome.

Example:

Ghost Paths and Pen

MetaData

Metadata describes other data. It provides information about a certain item's content. For example, an image may include metadata that describes how large the picture is, the color depth, the image resolution, when the image was created, and other data. A text document's metadata may contain information about how long the document is, who the author is, when the document was written, and a short summary of the document.
Web pages often include metadata in the form of meta tags. Description and keywords meta tags are commonly used to describe the Web page's content. Most search engines use this data when adding pages to their search index.


http://www.techterms.com/definition/metadata