Decoded:

The beginning and the end of something

Alpha α (eye-like character inside the Omega symbol) = beginning/beginnings

Omega Ω = The end of something

Alpha is the first letter of the Greek alphabet, and omega is the last letter. Thus the phrase the Alpha and the Omega means the beginning and the end. Since God is eternal and has no beginning or end, the spiritual meaning of the phrase is that He is the Beginner (the First) and also Ender (the Last).

I AM, THAT I AM (Beyond the beginning and the end - Eternal)