A moon shuttle was an unsophisticated type of shuttlecraft used in the mirror universe during the 2150s.
In 2155, Captain Jonathan Archer imagined that he saw a counterpart of himself from a parallel universe. The illusion told him that he would more probably "end up commanding a moon shuttle" than recieve official authorization from Starfleet to command an advanced starship named the Defiant. (ENT: "In a Mirror, Darkly, Part II")