The term 'Piece of Machinery' can be summarized as a device that is composed of multiple parts that work together to perform a specific task. The crossword solution for this term is 'COG, ' which is an abbreviation for cogwheel, a type of wheel with teeth that interlock with other toothed wheels to transmit rotational force. Cogwheels are commonly used in machines such as clocks, bicycles, and automobiles.