No, Omega does not mean Z.
Omega (Ω ω) is the last letter of the Greek alphabet. Zeta (Ζ ζ) is the sixth letter of the Greek alphabet. These are distinct letters with different positions and sounds. Thinking of "Alpha and Omega" as the beginning and end highlights the difference between these symbols and ideas. They aren't even close to each other in the Greek alphabet!
| Letter | Position |
|---|---|
| Zeta (Ζ ζ) | 6th |
| Omega (Ω ω) | Last |
