Here's what each part of the name signifies:

RM-065: This is the model or series designation for the trimpot variable resistor, providing certain specifications or features.

50K OHM: This indicates the resistance value of the trim pot, which is 50 kilohms. The unit of resistance is ohms.

Trimpot Variable Resistor: This describes the type of component. A trim pot is a type of potentiometer (variable resistor) that can be adjusted or trimmed for specific applications.

6mm: This refers to the size of the trumpet, typically indicating the diameter of the shaft or the physical size of the component.

PRINT CODE 503: This indicates the printed code used to represent the resistance value. In this case, "503" represents a resistance value of 50,000 ohms or 50 kilohms. The printed code helps in identifying the component's resistance value easily.