Question: what is the significance of the iron coin arya has?
Answer: The Iron coin is the symbol of a faceless man. Jaqen said that if Arya ever needed to get in contact to give the coin to any man of Braavos with the words "valar morghulis" and the bravosi would take care of the rest. Faceless Men are A) world renowned assassins based out of Braavos and B)