The emblem at right is one of many examples of “Marian Monograms” employed by devotees of the Virgin Mary within the Catholic Church. This particular example appears on the reverse of the “miraculous medal,” based on a design received in a vision of the Virgin by St. Catherine Labouré in 1830. According to the legend, Theresa was directed by Mary to fashion the medal as a symbol of charity.
The intertwined cross and initial “M” are meant to illustrate the scene of Jesus’ crucifixion described in the Gospel of John, and represents Mary at the foot of the cross. The twelve stars depicted represent the twelve tribes of Israel. The two hearts are, respectively, the Sacred Heart of Jesus and the Immaculate Heart of Mary.