High Yo-yo
A high yo-yo is a done by going into a climbing turn. At about the 90 degree point of your turn, you roll partially inverted and finish the turn diving back to your original altitude. It is used to convert speed into altitude during the initial part of the turn with the lower speed allowing you to make a tighter turn. Near the apex of your turn, you then convert the altitude you gained back into speed by going back down to your initial altitude