An interesting painting “Slave for Sale” (Una Esclava en Venta), 1897, by Spanish artist Jose Jimenez Aranda.
From it, I learned that just as there were Roman numerals, there were Greek ones in Greece. Pay attention to the plate. It reads ΡΟΔΟΝ ΕΤΩΝ ΙΗ ΠΩΛΕΙΤΑΙ ΜΝΑΣ Ω, which translates to “Rhodon, 18 years old, for sale for 800 minae”.
In the Greek text, there are two numbers – ΙΗ and Ω. In those times, Greeks wrote numbers using letters: Α (alpha) = 1, Β = 2, …, I = 10, K = 20, …, Ρ = 100, Σ = 200, …, Ω = 800.
Accordingly, ΙΗ is 18. The line above it indicates that it is a number, as does the line above Ω.

