MIT s Tech Model Railroad Club (TMRC) is famous for coining some tech terms. The TMRC spawned a unique vocabulary. Compiled in the TMRC Dictionary,4 it included terms that later became part of the hacker's Jargon File, such as "foo", "mung", and "frob". Other substitutions include "orifice" for office (as in later Back Orifice), "cruft" for garbage, and "hack", meaning an elaborate college prank carried out by MIT students. This last definition is the basis for the term "hacker".