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Greek numerals
The ancient Greeks used their alphabet to describe Greek numerals. It started with
α´ β´ γ´ δ´ ε´ ϛ´ ζ´ η´ θ´ ι´
what corresponds to the Arabic numerals
1 2 3 4 5 6 7 8 9 10
Zero
The 0 sometimes occurs as o macron (ō). There's been discussion for centuries whether or not 0 is a number. Today we call it a number, and for writing decimal numbers we just need it.
Large numbers
The Greeks had no decimal system. Therefore there were also letters for
0 1 2 3 4 5 6 7 8 9 10 ō α´ β´ γ´ δ´ ε´ ϛ´ ζ´ η´ θ´ ι´
10 20 30 40 50 60 70 80 90 100 ι´ κ´ λ´ μ´ ν´ ξ´ ο´ π´ ϟ´ ρ´
1000 2000 3000 4000 5000 6000 7000 8000 9000 ͵α ͵β ͵γ ͵δ ͵ε ͵ϛ ͵ζ ͵η ͵θ