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https://en.m.wikipedia.org/wiki/Keys_of_Heaven
Manufactured Symbolic Keys of Heaven
The crossed keys in the coat of arms of the Holy See symbolise the keys of heaven entrusted to Simon Peter. The keys are gold and silver to represent the power of loosing and binding. The gold key alludes to the power in the kingdom of the heavens and the silver key indicates the spiritual authority of the papacy on earth. The cord with the bows that unites the grips alludes to the bond between the two powers. The triple crown (the tiara) represents the pope's three functions as "supreme pastor", "supreme teacher" and "supreme priest". The gold cross on a monde (globe) surmounting the tiara symbolizes the sovereignty of Jesus.
In ecclesiastical heraldry, papal coats of arms (those of individual popes) and those of the Holy See and Vatican City State include an image of crossed keys to represent the metaphorical keys of the office of Saint Peter, the keys of heaven, or the keys of the kingdom of Heaven, that, according to Catholic teaching,[1] Jesus promised to Saint Peter, empowering him to take binding actions.[2] In the Gospel of Matthew 16:19, Jesus says to Peter, "I will give you the keys of the kingdom of heaven, and whatever you bind on Earth shall be bound in heaven, and whatever you loose on Earth shall be loosed in heaven."