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AEASTON'S
Alpha, the first letter of the Greek alphabet, as Omega is the last. These letters occur in the text of Rev. 1:8, 11; 21:6; 22:13, and are represented by “Alpha” and “Omega” respectively (omitted in R.V., 1:11). They mean “the first and last.” (Comp. Heb. 12:2; Isa. 41:4; 44:6; Rev. 1:11, 17; 2:8.) In the symbols of the early Christian Church these two letters are frequently combined with the cross or with Christ’s monogram to denote his divinity.
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.