The New Dictionary of Cultural Literacy, Third Edition. 2002.
alpha and omega
(AL-fuh; oh-MAY-guh, oh-MEG-uh, oh-MEE-guh) The beginning and the end. In the New Testament Book of Revelation, God says, I am Alpha and Omega, meaning that he is the beginning and end of all things. In the Greek alphabet, alpha is the first letter and omega is the last.