This is a tag :
A tag is a string found in the Link to another table columns.
Its contents will correspond to what is in the first column of the table to which it is linked:
Etiquette is the French term whose designs tag whose use is widespread today in general.
A tag (or tag, tag, label) is a keyword (meaning) or term associated with or assigned to information (for example an image, an article, or a video clip), which describes a feature of the tag object and allows easy grouping of information containing the same keywords.