The American Church Dictionary and Cycopedia
Alpha and Omega
The first and last letters of the Greek alphabet. They are used of our Lord to set forth His eternal and divine Nature, as in Revelation I:II, "I am Alpha and Omega, the First and the Last." In their Greek form these letters are used in the symbolism and decoration of the Church, either separately or as a monogram.
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Miller, William James. Entry for 'Alpha and Omega'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/a/alpha-and-omega.html. 1901.