Icon of the Three Hands:   St. John Damascene had his hand cut off by the caliph but it was restored during the night by the Theotokos.  In gratitude, he had a silver hand added to the metalwork on the icon of the Theotokos.  More amazing than the restoration of his hand is the hardness of hearts  of those who witnessed the miracle but remained in the Muslim religion.

http://oca.org/saints/lives/2015/06/28/101839-icon-of-the-mother-of-god-of-ldquothe-three-handsrdquo

http://images.oca.org/icons/sm/june/0628threehandedicon01.jpg