A (alpha)

alpha, the first letter of the Greek alphabet (Omega is the last letter of the Greek alphabet.)

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 the Revised Version, New International Version, and the New Revised Standard Version 1:11). They mean "the first and last." (Compare 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 indicate his divinity.