Sacred Letter Numerology (聖字母數秘)
Gematria, Isopsephy & Abjad — Where Every Letter Is a Number
Overview
In three of the world's great scriptural languages — Hebrew, Greek and Arabic — every letter is also a number, so every word carries a numeric value: the sum of its letters. This is the basis of gematria (Hebrew), isopsephy (Greek) and abjad (Arabic), a family of interpretive practices thousands of years old. Words that add up to the same value are held to be secretly linked — the Hebrew words for 'love' (אהבה) and 'one' (אחד) both total 13, a coincidence Kabbalists read as a teaching. This endpoint computes the value of any word or phrase across all three systems and, for Hebrew, across the five classical calculation methods, and surfaces famous words that share the same total.
Origin & history
Letter-numerals are older than positional notation: before the adoption of Hindu-Arabic digits, the Hebrews, Greeks and Arabs all wrote numbers with their alphabets. Greek isopsephy is attested from at least the Hellenistic period and appears in graffiti at Pompeii and in the Book of Revelation (the famous 666). Hebrew gematria is discussed in the Mishnah and became a central tool of Kabbalah, especially in the works of the medieval Spanish and Provençal mystics and the Zohar. Arabic abjad numerals, and the divinatory science of ḥisāb al-jummal built on them, flourished across the Islamic world and were used in talismans, chronograms and lettrist mysticism (ʿilm al-ḥurūf).
Each tradition developed refinements. Hebrew gematria alone has dozens of named methods; the most standard are Mispar Hechrachi (the plain value), Mispar Gadol (which gives the five final letter-forms the higher values 500–900), Mispar Katan (which reduces each letter to a single digit), Mispar Siduri (which uses each letter's ordinal position 1–22), and the Atbash cipher (which swaps each letter with its mirror across the alphabet before summing). Greek isopsephy preserves three archaic numeral letters — digamma/stigma (6), koppa (90) and sampi (900) — that dropped out of the ordinary alphabet but are still needed to reach values like 666. Arabic abjad has two regional orderings; askTIAN uses the Eastern (Mashriqi) order. The letter values themselves are fixed and universally agreed, so the arithmetic is exact — what varies is only which method one chooses and how one interprets the result.
How it works
Give a word or phrase. If it is written in Hebrew, Greek or Arabic script, the system detects the alphabet automatically; a romanized word is transliterated into Hebrew (the consonantal skeleton, since biblical Hebrew is written without vowels). Diacritics — Greek breathing marks and accents, Hebrew vowel points, Arabic harakat — are stripped so an accented letter still scores as its base letter. The engine then sums the letter values: for Hebrew it reports all five classical methods; for Greek and Arabic, the standard value and the ordinal. It also reduces the headline value to a single root digit (1–9) and lists curated famous words that share the same standard value, illustrating the classical technique of reading equal-value words together.
Good for
- Computing a word or name's Hebrew gematria across all five classical methods
- Greek isopsephy (including the archaic 6/90/900 letters)
- Arabic abjad values (Eastern order)
- Finding the root digit of a word's value
- Seeing famous words that share the same value
- Comparing a name's value across the three sacred alphabets
Use cases
Value a Hebrew Word or Name
Send a Hebrew word (or a romanized name) and receive its value in Mispar Hechrachi, Gadol, Katan, Siduri and Atbash, with the per-letter breakdown.
Greek Isopsephy
Score a Greek word — the engine handles the archaic numeral letters and final sigma, so classic totals like Ἰησοῦς = 888 come out exactly.
Arabic Abjad
Compute the abjad value of an Arabic word, with the common letter-form variants normalised (الله = 66).
Equal-Value Links
See the famous words that share a value with your input — the heart of the interpretive practice (אהבה and אחד both = 13).
Key terms
- Gematria (גימטריא)
- The Hebrew practice of computing a word's value from its letters, and reading words of equal value as linked. Central to Kabbalah.
- Isopsephy (ἰσοψηφία)
- The Greek equivalent — 'equal-pebble-counting' — in which each Greek letter has a numeric value and words are summed.
- Abjad (حساب الجمل)
- The Arabic letter-numeral system and the divinatory arithmetic (ḥisāb al-jummal) built on it, used in chronograms and talismans.
- Mispar Gadol / Katan / Siduri
- Hebrew methods: Gadol gives finals the values 500–900; Katan reduces each letter to a single digit; Siduri uses each letter's ordinal position 1–22.
- Atbash
- A Hebrew letter-substitution cipher pairing the first letter with the last (א↔ת, ב↔ש, …); the substituted word is then valued.
API
The askTIAN Sacred Letter Numerology endpoint computes the numeric value of any word or phrase across the three great alphabetic-numerology systems: Hebrew gematria (with the five classical methods — Mispar Hechrachi, Gadol, Katan, Siduri and Atbash), Greek isopsephy (including the archaic numeral letters ϛ/ϟ/ϡ and final sigma) and Arabic abjad (Eastern order, with letter-form variants normalised). It auto-detects the alphabet from the script, transliterates romanized Hebrew, strips diacritics so accented letters still score, and returns the per-letter breakdown, every method's total, the 1–9 root digit and curated famous words that share the standard value. The letter values are fixed, so the arithmetic is exact and gold-locked against famous totals (חי=18, יהוה=26, Ἰησοῦς=888, الله=66). A best-effort LLM reading is returned in parsable sections (set interpretation:false for structured data only). Honest rails: the totals are exact, but linking words that share a value is a traditional interpretive practice, not a validated predictor, and not medical, legal or financial advice.
Endpoint: POST /trpc/gematria.calculate — 2 TIAN Points. See the API documentation and Playground.