A structural element in written works, particularly books, serves to organize content and guide readers. These typically appear as titles preceding sections or chapters, providing a concise overview of the material that follows. Common examples include chapter titles, section names, and subtopic indicators within a chapter.
Effective use of these elements enhances readability and comprehension. By clearly delineating topics, these organizational tools enable readers to quickly identify relevant information and navigate the text more efficiently. Historically, these elements evolved from simple markers to sophisticated signposts, reflecting the increasing complexity of written communication.