What are the terminals in this 6 pin potentiometer?
Edit: Check the datasheet for the TT Electronics P120KGE, it appears to be your exact potentiometer:


This appears to be a standard dual potentiometer, commonly used as a volume control in stereo audio applications. It contains 2 individual potentiometers, connected to a common shaft, so it has 2 wipers and 4 outer terminals. 

In order to determine the pinout, first you will need to find the resistance of the potentiometer, which is usually marked on the back. There should be 2 sets of 2 pins that show that resistance between them no matter what position the knob is in, and those are the outer terminals. The remaining 2 pins are the wipers. The resistance between them and the connected outer terminals will vary when the knob is turned.