Under "man overboard rescue turn", Wikipedia lists four turns: the Quick Turn, The Anderson Turn, the Williamson Turn, and the Scharnow Turn. The Quick Turn appears to apply to sailing vessels, which doesn't fit with your question. The Anderson Turn brings you back over the same spot on the same heading, not a reciprocal heading. So that's not it. The Scharnow Turn is apparently applicable when the spot being returned to is relatively far aft. So, I'll guess the Williamson Turn. Again, according to Wikipedia, the rudder should initially be put full over toward the side the man went over until your course deviates 60 degrees from your base course. At that point, the rudder should be shifted fully to the opposite side and maintained until you are within 20 degrees of the reciprocal course, at which point the rudder should be put amidships.
SR Powers, William T., S-178