Enter a clue or pattern or both:
The Clue
Electronic control systems (6 letter answer)
The Answer
SERVOS
Tags
Notes
The answer SERVOS is so rare that it appears less than once every 2500 puzzles.
Definition
SERVO as a noun:
1. (servo, servomechanism, servosystem) = control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system