What is a non-circulating book?

Excuse me, could you please clarify for me what exactly is meant by a "non-circulating book"? Is it a term used specifically in the context of libraries or perhaps it has a broader meaning in the realm of finance or even cryptocurrency? Are these books perhaps rare, valuable, or perhaps they contain sensitive information that restricts their distribution? I'm intrigued to learn more about this concept and how it might apply in different fields.