Servo

The term servo can refer to:

Servomechanism — usually just shortened to "servo", is a device used to effect mechanical motion for a specified distance. Can also refer to any type of self-regulating feedback system or mechanism.
Servo motor — A special (typically electric) motor that usually includes a velocity and/or position feedback device and is powered by a servo amplifier to form a servomechanism.
Servo amplifier — An amplifier that powers a servo actuator, sometimes called a servo drive when referring to electric servo motor type servomechanisms.
Servo drive — A servo amplifier that powers an electric servo motor
Another device commonly referred to as a servo is used in automobiles to amplify the steering or braking force applied by the driver. In this form this device is not a true servo, but rather a mechanical amplifier.
Tom Servo — One of the robot characters in the Mystery Science Theater 3000 television series.
Servo, an Australian term for gas filling stations.
Servo - A character in the Superhuman Samurai Syber-Squad television series.
Servo - Robotic Character from The Sims: Livin' Large and The Sims 2: Open for Business Video Games.
"Servo" - fictional pen-shaped multipurpose device employed by the Star Trek original series character Gary Seven, and also by his assistants in various novelizations.