Find out why, why it's called the 'miraculous medal', and learn the history behind its origin in this article by The Catholic Company:
The Front: On the front of the Miraculous Medal, Mary stands on a globe, which represents the earth; a serpent is crushed beneath her feet. This image shows Mary in her role as "Queen of Heaven and Earth." The serpent represents Satan, who was defeated by Mary's obedience to God, which gave us our Savior. The rays coming from her hands symbolize the graces Mary gives to those who ask her for them. 1830 is the year that the Blessed Mother appeared to St. Catherine Labouré and requested the making of this medal.
THE PROMISES OF THE MEDAL
When Our Lady visited Saint Catherine Labouré on November 27th, 1830, rays of light flowed from the rings (made of precious stones) on her fingers. However, some of the stones on the rings did not shine. Mary explained: "These rays symbolize the graces I shed upon those who ask for them. The gems from which rays do not fall are the graces for which souls forget to ask." Mary then spoke of the medal which she was requesting with these words: "All who wear it will receive great graces; they should wear it around the neck. Graces will abound for persons who wear it with confidence."
The medal is a visible sign
of the wearer's devotion to
Mary and to her Son, Jesus.
Find out more here: https://www.catholiccompany.com/content/learn-more-about-the-miraculous-medal