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Servomechanism, usually just shortened to "servo", is a special (typically electric) motor that typically includes a velocity and/or position feedback device to effect mechanical motion for a specified distance. Can also refer to any type of self-regulating feedback system or mechanism

RC Servo, a type of servomechanism used in radio controlled models and robotics

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 slang term for a petrol station

Servo, a character in the Superhuman Samurai Syber-Squad television series

Servo, robotic non-player character from and player character in The Sims 2: Open for Business computer games/expansion packs

Servo, a non-player character from World of Warcraft, a computer game

"Servo", fictional pen-shaped multipurpose device employed by the original Star Trek series character Gary Seven, and also by his assistants in various novelizations