In the Orthodox Church Tradition,the Mystery of Holy Communion is carried out by giving wine and prosphora. The bread which is specially produced for the purpose of communion, and it is called Prosphora (is a Greek word that means something that is offered.)
Prosphora Seals or Stamps are required in the final stage to make Prosphora for the Liturgy. Prosphora, is the metaphorical representation of Christ body, that is offered to the people. Something that first time occured during the Last Supper.