Chalice and Wafer
Chi Rho and Alpha and Omega windows
One of the best loved symbols is that of the Chalice and Wafer which symbolizes the institution of the Lord's Supper. These objects are used in Christian art as an aid to worship, reminding us of the night in which Jesus was betrayed as well the institution of the Lord's Supper for the forgiveness of our sins and for the strengthening of our Christian faith.
The Chi Rho monogram is the oldest used with reference to Christ and is sometimes called a "Christogram." The Christogram on this window also includes the first and last letters of the Greek alphabet - Alpha and Omega. This usage is based on Revelation 22: 13 - "I am the Alpha and Omega, the first and last, the beginning and the end." These were added to symbolize the divinity of Christ - that He truly is true God.