As you can see, the IC chip has 4 terminations. There are 4 pins in total in this voltage regulator IC. It has 1 outputs to ensure that the performance of this regulator is prompt and sufficient. The component shown here is a typical Other Regulators component. It is important to note that this device has a FIXED POSITIVE SINGLE OUTPUT STANDARD REGULATOR regulator type. There is a way of packing the regulator that is called TR.
UA78M05C Features
Other Regulators subtageroy TR method of packing
UA78M05C Applications
There are a lot of Texas Instruments UA78M05C Linear Voltage Regulators applications.