Αα=1 Ββ=2 Γγ=3 Δδ=4 Εε=5 Ϝϛ=6 Ζζ=7 Ηη=8 Θθ=9 Ιι=10 Κκ=20 Λλ=30 Μμ=40 Νν=50 Ξξ=60 Οο=70 Ππ=80 Ϙϙ=90 Ρρ=100 Σσς=200 Ττ=300 Υυ=400 Φφ=500 Χχ=600 Ψψ=700 Ωω=800 ϡ=900
Isopsephy (/ˈaɪsəpˌsɛfi/; ἴσος isos meaning "equal" and ψῆφος psephos meaning "pebble") or isopsephism is the practice of adding up the number values of the letters in a word to form a single number. The total number is then used as a metaphorical bridge to other words evaluating the equal number, which satisfies isos or "equal" in the term. The early Greeks used pebbles arranged in patterns to learn arithmetic and geometry, which corresponds to psephos or "pebble" and "counting" in the term. Isopsephy is related to gematria—the same practice using the Hebrew alphabet and, later, also the English alphabet—and the ancient number systems of many other peoples (for the Arabic alphabet version, see Abjad numerals). A gematria of Latin script languages was also popular in Europe from the Middle Ages to the Renaissance and its legacy remains in code-breaking, numerology and Masonic symbolism today (see arithmancy).
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