When you're reading an article, often you'll see a quote from the very same article written in large, bold letters. I guess it's supposed to entice skimmers to read it or some such. What is that called?
Two of the main terms for this are callout and pull quote, the former meaning "A pull quote: an excerpt from an article (such as in a news magazine) that is duplicated in a large font alongside the article so as to grab a reader's attention and indicate the article's topic", and the latter "In newspaper and magazine publishing, a brief excerpt drawn from an article and used out of context."
Related terms (but not such as the question asks for) include sidebar, "a short news story printed alongside a larger one" or "information placed at the side of a webpage"; hook in the sense "A brief, punchy opening statement intended to draw the reader or viewer into a book or play"; and blurb, "A short description of a book, film, musical work, or other product written and used for promotional purposes." Like callouts, box quotes, or pull quotes, these items may appear in large bright type to attract attention.