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A chapter is one of the main divisions of a piece of writing of relative length, such as a book of prose, poetry, or law. In each case, chapters can be numbered or titled or both. An example of a chapter that has become well known is "Down the Rabbit-Hole", which is the first chapter from Alice's Adventures in Wonderland. The "§" symbol is commonly used to represent a chapter.
Unusual numbering schemes 
In works of fiction, authors sometimes number their chapters eccentrically, often as a metafictional statement. For example:
- The Curious Incident of the Dog in the Night-Time by Mark Haddon only has chapters which are prime numbers.
- At Swim-Two-Birds by Flann O'Brien has the first page titled Chapter 1, but has no further chapter divisions.
- God, A Users Guide by Seán Moncrieff is chaptered backwards (i.e., the first chapter is chapter 20 and the last is chapter 1).
- Every novel in the series A Series of Unfortunate Events by Lemony Snicket has thirteen chapters, except the final installment (The End), which has a fourteenth chapter formatted as its own novel.
- Mammoth by John Varley, has the chapters ordered in chronological order from the point of view of a non-time-traveler, but, as most of the characters travel through time, this leads to the chapters defying the conventional order
Chapter structure 
Many novels of great length have chapters. Non-fiction books, especially those used for reference, almost always have chapters for ease of navigation. In these works, chapters are often subdivided into sections. The chapters of reference works are almost always listed in a table of contents. Novels sometimes use a table of contents, but not always.
In ancient civilizations, books were often in the form of papyrus or parchment scrolls, which contained about the same amount of text as a typical chapter in a modern book. This is the reason chapters in recent reproductions and translations of works of these periods are often presented as "Book 1", "Book 2" etc.