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  A device for moving or controlling a mechanism or system. It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. An actuator is the mechanism by which a control system acts upon an environment. The control system can be simple (a fixed mechanical or electronic system), software-based (e.g., a printer driver, robot control system), or a human or other agent.
NIST SP 800-82r3
NISTIR 8183 from NIST SP 800-82r3
NISTIR 8183 Rev. 1 from NIST SP 800-82r3
NISTIR 8183A Vol. 1

  A portion of an IoT device capable of changing something in the physical world.
NISTIR 8259 from NISTIR 8228