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tag

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n. ~ 1. A label containing information that is attached, sometimes with string, to something. - field tag, n. ~ 2. A short string of characters used to label the class of a data element in a record.

Notes: 

A MARC tag2, for example, is formed from three digits, such as 245 for the title field and 651 for a Geographical Added Entry. Encoded Archival Description (EAD) uses a short string enclosed in angle brackets to indicate the beginning and end of a specific type of data, such as <bioghist> for biographical/historical notes or <physdesc> for statements of extent. Hypertext Markup Language (HTML) and extensible markup language (XML) use pairs of tags to indicate the beginning and end of data elements embedded in text; for example <H1> and </H1> surround a first-level heading.