Isopsephy (/ˈaɪsəpˌsɛfi/; Greek: ἴσος, romanized: ísos meaning "equal" and Greek: ψῆφος, romanized: psêphos, lit. 'pebble' meaning "count") or isopsephism is the practice of adding up the number values of the letters in a word to form a single number.[1] The total number is then used as a metaphorical bridge to other words evaluating the equal number,[2] which satisfies isos or "equal" in the term. Ancient Greeks used counting boards for numerical calculation and accounting, with a counter generically called psephos ["pebble"], analogous to the Latin word calculus, from which the English calculate is derived.
Isopsephy is related to gematria: the same practice using the Hebrew alphabet. It is also related to 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 an influence in code-breaking and numerology.
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