Fausset's Bible Dictionary
Revelation 1:8, "I am the Alpha Αlpha ( Α ) ( α ) and the Omega Οmega ( Ω ) ( ω )," the first and the last letters. Christ "the Beginning and the Ending" comprises all between. Genesis and Revelation meet in Him. The last presents man and God reconciled in paradise, as the first presented him innocent and in God's favor in paradise. I accomplish finally what I begin (Philippians 1:6). Always the same. Before all the church's foes, Satan, the beast, and the false prophet; and about to be after they are no more as a power (Hebrews 13:8).
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Fausset, Andrew R. Entry for 'Omega'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/o/omega.html. 1949.