Alpha and omega are the first and last letters of the Greek alphabet, and a title of Christ and God in the Book of Revelation. This pair of letters is used as a Christian symbol, and is often combined with the Cross, Chi Rho or other Christian symbols. A (a) and Z (z) share the similarity with alpha and omega.
The Chi-rho symbol with Alpha and Omega, Catacombs of Domitilla, Rome
The Greek letters alpha and omega surround the halo of Jesus in the catacombs of Rome from the 4th century
"ΑΩ" in stained glass
Christian symbolism is the use of symbols, including archetypes, acts, artwork or events, by Christianity. It invests objects or actions with an inner meaning expressing Christian ideas.
The Crucifix, a cross with corpus, a symbol used in the Catholic Church, Lutheranism, the Eastern Orthodox Church, and Anglicanism, in contrast with some other Protestant denominations, Church of the East, and Armenian Apostolic Church, which use only a bare cross
Early use of a globus cruciger on a solidus minted by Leontios (r. 695–698); on the obverse, a stepped cross in the shape of an Iota Eta monogram
20th–21st century Celtic cross with inscribed symbolism
A written Ichthys from ancient Ephesus, with an eight-spoked wheel.
