A rudder is a flat piece of metal or wood attached to the back of a boat or airplane. It helps to control the direction the vehicle moves in by steering it left or right. Full definition
However, as Christian Rudder says, these systems are, at the end of the day, striving to get as close as possible to an unattainable formula: (globaldatinginsights.com)
Because I feel like, if we're gonna go back through history, the moral rudder of the American Church has been the black folks. (relevantmagazine.com)