From the similarity of thestigma (Ϛ), a Byzantineligature of the common Greekconsonant clusterσ-τ usingsigma'slunate formϲ, with the medieval variant of the numerical form ofdigamma (
), employed inGreek numerals for the value six, its place in theepichoricMilesian Greek alphabet (where it was more often writtenϜ).
ΣΤ΄
The Greek numbers from 1 to 999 are properly marked using the Greek numeral signκεραία(keraía) (ʹ ), though they may also be found with thetonos (΄ ) orapostrophe (' ).
Greek numerals on Wikipedia.WikipediaΕλληνικό σύστημα αρίθμησης on the Greek Wikipedia.Wikipediael