 The combination of the letter M with a Latin cross is found as part of the 1830 design of the Miraculous Medal (also known as the Medal of Our Lady of Graces based on Saint Catherine Labouré revelations).In that design the letter M is surmounted by a normal Latin cross standing on a bar interlaced with the letter M.

The papal coat of arms of John Paul II features a cross shifted away from its usual central position to make room for a letter "M" in the sinister base quarter (lower right as seen by the viewer), which represents the Virgin Mary’s presence at Jesus’ death on the cross.In a 1978 article, Vatican newspaper, "L'Osservatore Romano", reported