This is the "show what you know" board. Some teachers call them exit slips...I don't call them that in front of my students because the kiddos to feel like they have to "perform" to enter/exit the classroom.
IMHO, performing something in order to leave makes it sound like they are prisoners that must produce something to get out on parole...makes them more antsy to get out on the classroom and want to stay away.
Maybe I should start calling them that because I can't seem to get my students to ever leave! :)