Classroom
Watch out: escritorio looks like it should mean something written (the root comes from escrito, written), but it actually means desk, the piece of furniture. The connection is historical: desks were where clerical writing was done, but the word names the object, not the act.
Keep in mind: pizarrรณn is the augmentative of pizarra (slate). The suffix -on makes it big slate, which became the standard word for a classroom board across most of Latin America. In some countries you will still hear pizarra instead.