The Skool is the elementary school that Zim, Dib, Gaz, and various minor characters attend in Invader Zim. It is possibly spelled improperly for comedic purposes. The school in the Pilot has a different external look; it even had an American flag, but no "quiet" sign was present in the cafeteria. The conditions at Skool are woefully inadequate: the bathrooms are filthy and graffiti-ridden, the cafeteria food has a mind of its own, and the teachers are often inordinately harsh toward their students, save for Mr. Elliot.