OMEGA - natch.....
Omega (Ω ω) is the 24th and last letter of the Greek alphabet.
Omega is often used to denote the last, the end, or the ultimate limit of a set, in contrast to Alpha, the first letter of the Greek Alphabet. Jesus declares himself to be the "Alpha and Omega, the beginning and the end, the first and the last", (Revelation 22:13, KJV, and see also 1:8).
Courtesy of Wikipedia.