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Related to black book: blue book
A book of people's names or titles (e.g., of literature, films, music, etc.) that are or will be banned, censured, or liable for punitive actions. During the height of the anti-communist "Red Scare" in the US, many authors, politicians, and public figures found their names in the government's black book.
little black book
A list or database of valuable contact information, especially of people in whom one is amorously or romantically interested. I don't feel the need to be in a long-term relationship because I've got plenty of phone numbers in my little black book.
1. A list of persons or things out of favor, as in Tom's in my black book these days. This usage dates from the 14th century and in time became more ominous. In 1536 the agents of King Henry VIII wrote in a black book the names of those to be censured or punished, specifically "sinful" English monasteries (whose lands Henry wanted to acquire). Today being in someone's black book still signifies being in trouble, at least with that person. Also see black list.
2. Also, little black book. A personal telephone directory listing girlfriends, or, less often, boyfriends. For example, Now that he's engaged to Ellen, Jim won't be needing his little black book. [1930s]
3. A list of measures or facts involved in the unfriendly takeover of one company by another. This usage is employed mainly in business and commerce. [c. 1980]
little black book
n. a book containing the names and addresses of acquaintances who are potential dates, usually put together by men. Am I in your little black book, or can you already tell that I wouldn’t go out with you?