It is a 10k Ohm W103 Trimpot Trimmer Potentiometer Variable Resistor. This potentiometer is easy to mount on a PCB and can be adjusted using a screwdriver. A variable resistor 10K(103) is a device that is used to change the resistance according to our needs in an electronic circuit. It can be used as a three-terminal as well as a two-terminal device. Mostly they are used as a three-terminal device. Variable resistors are mostly used for device calibration.