A Slug in journalism is a name or reference to a work.
Here is a use of the word form a journalism course assignment:
"As you will learn, each assignment should have a name only eight characters long or less. As in "fire." (That "name" also is called a slug in the journalism business.)"
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A slug line is a short phrase or label that describes the content of an article or news story. It helps editors and writers keep track of different pieces of content and organize them effectively. In copy reading and headline writing, a slug line is often used to provide a quick summary or guide for the main topic of the text.