Which hand is referred to as the control hand when repelling?

In repelling, the term "control hand" specifically refers to the hand that is responsible for managing and controlling the speed and descent of the rope. This hand typically grips the rappel device and is used to apply friction to regulate how quickly the person descends. While it can be either the left or right hand depending on the individual and their preference or setup, the standard terminology in the context of climbing and repelling refers to this hand as the control hand. It emphasizes the critical function that this hand plays in safely navigating the descent. The focus on the function of managing the descent is key to understanding why this term is used universally, regardless of which hand it may be for any individual.