Medieval M-shaped Badge with a crown above. M-badges symbolized St. Mary, Queen of Heaven. England, late 14- early 15 c.
From the book "Pilgrim Souvenirs and Secular Badges."
Badges were used by medieval pilgrims as souvenirs from the holy places which they had attended, as tangible proves of attendance such a holy place, as remedies with miraculous properties. Each place of cult had it's own badges so seeing a pilgrim wearing certain badges one could name the places which this pilgrim had visited. Also, so called secular badges existed which could belong to an authority or a noble who gave these badges to his/her courtiers, srevants, supporters and so on. Badges commemorating a major event existed, too.