Definition:Greek Numerals/Attic System

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The Greek numerals from the Attic period (c. 500 BCE to c. 300 BCE) are similar to the Roman system:

\(\ds \textsf{I}:\) \(\) \(\ds \)one\(\)
\(\ds \Pi:\) \(\)penta\(:\) \(\ds \)five\(\)
\(\ds \Delta:\) \(\)deka\(:\) \(\ds \)ten\(\)
\(\ds \Eta:\) \(\)hekaton\(:\) \(\ds \)one hundred\(\)
\(\ds \Xi:\) \(\)chilioi\(:\) \(\ds \)one thousand\(\)
\(\ds \Mu:\) \(\)myriad\(:\) \(\ds \)ten thousand\(\)

$\Pi$ was later written in a different form, with a shorter right leg, and from there it appears to have evolved into $\Gamma$.

Numbers were combined in a similar way to Roman numbers, but with additive forms only.

For example, $32718$ would have been written $\Mu \Mu \Mu \Xi \Xi \Eta \Eta \Eta \Eta \Eta \Eta \Eta \Delta \Pi \textsf {III}$.

Later evolutions introduced symbols for $50$, $500$ and $5000$, consisting of a tiny version of the appropriate power of $10$ nestled under the right hand (short) branch of the short-leg version of $\Pi$.

Such characters are difficult to render neatly, and as they are of limited importance, this has not been attempted on $\mathsf{Pr} \infty \mathsf{fWiki}$.