Greek Isopsephy

Classical Greek used its own alphabet for ordinary counting rather than a separate numeral system, and isopsephy simply applies that existing numeral table to words. The twenty four letters taught in school run Alpha at 1 through Omega at 800, but the counting table itself was never limited to twenty four symbols: three archaic letters that had dropped out of the spoken alphabet by the classical period, digamma or stigma for 6, koppa for 90 and sampi for 900, were kept on for arithmetic alone, so that every value from 1 to 900 had a single dedicated symbol rather than requiring combinations, unlike the later positional systems that replaced it.

To find a word's isopsephic value, each letter's numeral value is simply added to the running total; a personal name, a divine epithet or a short phrase all reduce to one sum by the same operation. Two words or phrases sharing an identical total were read in antiquity as bound together in meaning, a form of wordplay that shows up in inscriptions, graffiti and literary riddles from the Hellenistic period onward, and the practice runs in close parallel to Hebrew gematria, which performs the identical operation on a different alphabet within a separate cultural and religious tradition.

Isopsephy left a visible trail through the Hellenistic and Roman worlds, appearing in graffiti scratched into the walls of Pompeii, in riddling epigrams collected in the Greek Anthology, and in the composition of magical amulets, where a divine name's numeric total might be inscribed alongside or instead of the name itself, on the reasoning that the number carried the name's power in condensed form. The technique was not confined to any one religious community: pagan, Jewish and Christian writers working in Greek all made use of it, each applying it to the names and phrases that mattered within their own tradition.

Because the method is entirely mechanical once the numeral table is known, isopsephy invites both genuine historical use and modern amateur reconstruction that goes well beyond what any ancient source claims, and readers should distinguish the two carefully: that isopsephy existed and was practised is well attested by inscriptions and literary examples; particular modern claims about what specific ancient totals were meant to signify are frequently later interpretation layered onto an old technique rather than a preserved ancient explanation.

Sources The Oxford Classical Dictionary, 4th editionSimon Hornblower, Antony Spawforth and Esther Eidinow (eds.) with The Greek Magical Papyri in Translation, Including the Demotic SpellsHans Dieter Betz, editor