Formal:
* Manuscript: This is the most common and formal term. It refers to any document written by hand, not just books.
* Codex: This term specifically refers to a book made of bound pages, as opposed to scrolls.
Informal:
* Handwritten book: This is a simple and straightforward description.
* Scribal copy: This term emphasizes that the book was created by a scribe.
* Illuminated manuscript: This term is used for manuscripts that have been decorated with illustrations and other embellishments.
Other:
* Autograph: This term refers to a book written entirely by the author's own hand.
* Palimpsest: This term refers to a document that has been written on top of another document, often with the previous text still faintly visible.
The best term to use depends on the specific context and the type of book you are referring to.