The Marian Cross is an informal name applied to a Roman Catholic cross design. It consists
of a traditional Latin cross with the crossbar extended on the right, and a letter "M" (for the Virgin Mary) in
the lower right quadrant.
A recently publicized use of the Marian Cross was on the personal coat of arms of Pope John
Paul II, displayed prominently on his casket at his funeral, although it may have been in use before this. A similar design
had appeared over a century earlier on the Miraculous Medal due to a Marian apparition to Saint Catherine Labouré in
1830, where the M represents the Virgin Mary standing at the foot of the cross during the Crucifixion of Jesus.
The coat of arms for Pope John Paul II is intended to be a homage to the central mystery
of Christianity, that of Redemption. It mainly represents a cross, whose form however does not correspond to any of the usual
heraldry models. The reason for the unusual shift of the vertical part of the cross is striking, if one considers the second
object included in the Coat of Arms: the large and majestic capital M, which recalls the presence of the Madonna under the
Cross and Her exceptional participation in Redemption. The Pontiff's intense devotion to the Holy Virgin is manifested in
this manner."