labeling

a slip of paper, cloth, or other material, marked or inscribed, for attachment to something to indicate its manufacturer, nature, ownership, destination, etc.

a short word or phrase descriptive of a person, group, intellectual movement, etc.

a word or phrase indicating that what follows belongs in a particular category or classification: The following definition has the label “Archit.”

Architecture. a molding or dripstone over a door or window, especially one that extends horizontally across the top of the opening and vertically downward for a certain distance at the sides.

a brand or trademark, especially of a manufacturer of phonograph records, tape cassettes, etc.: She records under a new label.

to affix a label to; mark with a label.

to designate or describe by or on a label: The bottle was labeled poison.

to put in a certain class; classify.

Also, radiolabel. Chemistry. to incorporate a radioactive or heavy isotope into (a molecule) in order to make traceable.