The Coat of Arms of the Archdiocese of Toronto is painted above the doors leading from the narthex to the nave in St. Michael's Cathedral.
The double cross and green galero hat with ten tassels indicate that the holder is an archdiocese.
The Latin motto of the archdiocese Quis ut Deus is a translation of Mich-a-ël, the name of the Archangel which means “who is like unto God”.
The colours red and white represent Canada. Across the shield is placed the spear of St. Michael, the patron of the diocese. His spear overcomes the Dragon’s head, symbolic of the Devil. The shaft has at its upper end a cross and attached are three gold maple leaves, a symbolic reference to the Province of Ontario.