The story has another meaning of alpha and omega. But if you really want to know Alpha- is the first letter of the Greek alphabet. Omega-While the omega is the 24th Greek alphabet.
Thank you. As you can see. I m fans of Levi x Eren lol. When you said alpha x omega my thought was flying to pokemon alpha sapphire & omega ruby video game =="
Just wanted to share this LEVIXEREN, ALPHAXOMEGA lovestoryyyyyyy it's so sweeeeet ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
http://myreadingmanga.info/rockndolless-himemiko-love-letter-shingeki-no-kyojin-dj-eng/