"The Orange Book" can be:
A. The nickname for the Approved Drug Products With Therapeutic Equivalence Evaluations, published by the U.S. Food and Drug Administration. The print version is sold through the U.S. Government Bookstore; an electronic version is posted free on the FDA Web site; The Mediregs Pharmaceutical Regulation Suite has historical editions back to the 23rd edition, which I believe came out in 2002 (subscription only). Or ...
B. A "compendium of significant unimplemented, nonmonetary recommendations for improving departmental operations" published by the Office of the Inspector General of the U.S. Department of Health and Human Services. As of 2007, the Orange Book was combined with the "Red Book" into the Compendium of Unimplemented Office of Inspector General Recommendations. The HHS-OIG posts both recent editions of the Compendium, and archived editions of the Orange Book and the Red Book.
C. The nickname for a book called Trusted Computer System Evaluation Criteria by the U.S. Department of Defense (DOD-5200.28-STD). The book is the "de facto standard for computer security today." The book and related information are available on the Dynamoo The Orange Book Site.
D. A technical standard in the fields of electrical engineering, computer science, etc.