A business card and accompanying note that seems to have been passed around during a meeting within the Department of Mysteries several years into Luna Lovegood's tenure there as an Unspeakable.
Handwriting analysis reveals the violet ink is from Lovegood, the pencil text is from Bradley Concannon, a co-worker of Lovegood's, and the blue ink from Roland Dillon, their supervisor.
Business Card reads as: Luna Lovegood, Unspeakable, Department of Mysteries,
Note:
Bradley: Lovegood, what part of being an Unspeakable lends itself to having a business card, exactly?
Luna: Unspeakable and unprintable do not mean the same thing, Bradley. I think they're nice.
Bradley: Yes, well, they're very nice but they're not exactly mysterious are they?
Luna: I could throw in an esoteric Agatha Christie reference just for you. Or make you your own!
Bradley: Would you seriously make me some? Maybe just a little simpler than yours?
Luna: Even though they're a violation of the secrecy of our mission for mystery and research and not speaking about things?
Bradley: Well, if you're going to have them, then I want some.
Roland: Could we perhaps focus? Let's keep up the facade that we do serious work in this department.