Sacrificial Coins reperesent the lives of the Seven Acolytes, and the teachers (Members of The Secret Society) they're giving life to. Each acolyte was represented with their name on one of the coins. On the opposite side of the scales, the teachers had their own coins, also marked with their names. During the ceremony, the scales of life would tip, marking the passing of the life from the young generation to the old. The Society didn't know that if they drink the elixir from the cup, the students would die to give them (the teachers) life. Rufus knew this, however. The coins were first seen in House of Drama / House of Codes when Nina is going through Victor's drawer.