A zefron poster makes a boss horcrux in AVPM. It is also one Harry Potter, Ron Weasly, Dumbledore and one Draco Malfoy's favorite chistmatic humanitaian. It is deeply rivaled by umbridges talor launtner poster.
Ron: THAT IS A BOSS ZEFRON POSTER!
and....
Dumby: He just seems like such a chistmatic humanitaian
and....
Ron: Let's take this bit of garbage down! (atempts to take Talor Launtner)
Novice: When I first examined him I felt oddly unwell. I would never have expected such a well presented gentleman to have posterior funk.
Senior: I think you mean posterior flank!
Poster commonly designed for use in schools and offices that generally consist of a photograph centered in a rectangular frame with black background, a title in large text and a description in smaller text.
This kind of poster has been repeatedly parodied and it's a common meme along imageboards.