A power control rod is a safety feature used to manage the output of nuclear reactors. The rod is inserted into the reactor's core to control the fission process and prevent a runaway reaction. Synonyms for power control rod include absorber rod, control rod, regulating rod, and safety rod. These terms are often used interchangeably and refer to the same mechanism. The absorber rod is used to absorb some of the neutrons that fuel the fission reaction, while the control rod is used to control the rate of the reaction. Regardless of which term is used, the power control rod is a crucial component of nuclear reactors and helps ensure their safe and efficient operation.