There isn't a single word to spell 83 in Greek the way we do in English. Greek uses a system where numbers are represented by letters of the alphabet. 83 would be represented as
πγ΄ (pi-gamma-prime).
* π (pi) = 80
* γ (gamma) = 3
* ΄ (prime) indicates the number is less than 1000
Therefore, πγ΄ is how you'd write 83 in Greek numerical notation.