course
Refers to an organized curriculum leading to a specific degree. The lowercase word "course" refers to a specific subject or class.
hack
An ingenious but harmless joke, often in the form of a temporary installation such as a police car on top of the Great Dome. See the Hack Gallery for examples.
Infinite Corridor
The long hallway forming the spine of the central campus, including all or part of Buildings 7, 3, 10, 4 and 8.
subject
A specific class.