Sim

Simulator, which can mean either:

The latter usage is more precise, because multiple processes may run on a single server CPU. In common usage, "sim" may also be used to mean region, though this meaning is deprecated because it is ambiguous. Most accurately, a region is simulated by a sim process running on a sim node.

Definitions by Lil Linden

From the Beta Server Office Hours 2010.02.12: