metania

The response is "Have mercy on me, O God, have mercy on me" accompanied by a prostration (or if you are not physically up to the demands of prostrations a sweeping bow called a metania which starts with crossing oneself and from the final hand position (hand at the right shoulder) one sweeps one's hand in a bow brushing your hand to the floor.

Stones Cry Out Mark O. 2010

At the beginning and at the end of each prayer said by the monk upon each knot or bead he makes the "great reverence" (he megale metanoia), bending down to the ground, so that the recitation of the rosary is often known as a metania.

The Catholic Encyclopedia, Volume 13: Revelation-Stock 1840-1916 1913