[toasty228]

Once they reach series Z does it go back to A or do we get a new format like AA, AB ?

[Npovview]

We live in Unicode times. We switch to Greek alphabets.

α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω

[tomwheeler]

After those are used up, it moves to Devanagari, Hangul, Katakana, Hiragana, and then Kanji.