The most extreme case of orthographic Greeklish, which achieves the greater optical resemblance to the Greek prototypes, is perhaps the so-called "byzantine" or "arabesque" or "calligraphic/artistic" Greeklish introduced in the Hellas mailing list by the mathematician George Baloglou. Main characteristics of Baloglou's "byzantine" is the distinction of σ and ς (σ=c ς=s), the distinction οf lower and upper letters, such as π=n, Π=TT or 5, θ=8, Θ=0 or Q, ψ=y, Ψ=4, and the unusual, but with great resemblance with the Greek prototype, transliterations σ=c, π=n ρ=p Ρ=P.