The term 'COMPONENT OF A RELAY' can be summarized as a 'LEG', which is a three-letter word. A relay is an electrical switch that is used to control a circuit by opening and closing it. The component of a relay is the LEG, which is a metal strip that connects the switch to the power source. The LEG is responsible for carrying the current from the power source to the switch, allowing the switch to open and close the circuit.