In StarCraft II, the Terran ability that calls down a temporary MULE for mineral mining is Call Down MULE.
MULE stands for Mineral Utility Light Excavator. An Orbital Command can spend energy to call one onto a mineral field, where it gathers minerals rapidly for a limited time. This gives Terran players a short-term economic boost without requiring an additional permanent worker.
The ability is one of the Orbital Command’s three signature energy options. The same structure can use Scanner Sweep to reveal an area or Calldown Extra Supplies to increase a supply depot’s capacity. Choosing between these options is a central Terran strategic decision.
A MULE is not a normal SCV and cannot construct buildings or repair units. It also disappears when its operating time ends, so its value comes from temporary accelerated mining rather than permanent worker production.