The greatest prayer of thanks is the " Eucharist" ("thanksgiving" in Greek) of Jesus, in which he takes bread and wine so as to offer in them to God all of creation, transformed. Whenever Christians give thanks, they are joining in Jesus' great prayer of thanksgiving. For we, too, are transformed and redeemed by Jesus, and so from the depths of our hearts we can be grateful and tell God this in a variety of ways. (YOUCAT question 488)
Roman Catholic - A monstrance, also known as ostensorium, is the vessel used in Roman Catholic, Old Catholic and Anglican churches to display the consecrated Eucharistic host, during Eucharistic adoration or Benediction of the Blessed Sacrament.