1) MU* game 2) MUD server 
TinyMUD is the name of a MUD server codebase, and the first MUD running that codebase. The MUD itself has subsequently come to be known as `TinyMUD Classic` or simply `Classic`, or occasionally `DaisyMUD` (since in the final days of its first incarnation, it ran on a computer named `daisy`). To distance itself from the combat orientated tr...