Some of the symbols used in the ceremony of Holy Orders are the chrism, antimins, Aer or chalice veil, and the Lamb or host. Holy Orders is a Christian ceremony referring to the ordination of a deacon into priesthood. See: http://www.ask.com/wiki/Holy_Orders.
Different Holy Orders have different symbols. Some symbols are common to a number of Holy Orders belonging to the same faith. The Ankh, or symbol of life, for example, is common to a number of religious orders.