But I'm going to go ask anyway. Please go do this... it's fun! Comment, and I'll do one for you if you want.
It's a Johari window. Essentially, it's a tool for people to better understand their personalities and communication styles. A person lists what they feel are their most prevalent traits, and then others list what they feel predominate, creating a grid with traits that are known to the subject and others, traits that are noticed by others, but not by the subject, and facades, which are noticed by the subject, but not by other people.