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The best-known example of Gematria is the Hebrew word Chai ("life"), which is composed of two letters which (using the assignments in the Mispar gadol table shown below) add up to 18. This has made 18 a "lucky number" among Jews, and gifts in multiples of 18 are very common among Jews.
Some identify two forms of gematria: the "revealed" form, which is prevalent in many hermeneutic methods found throughout Rabbinic literature, and the "mystical" form, a largely Kabbalistic practice.
Though gematria is most often used to calculate the values of individual words, psukim (Biblical verses), Talmudical aphorisms, sentences from the standard Jewish prayers, personal, angelic and Godly names, and other religiously significant material, Kabbalists use them often for arbitrary phrases and, occasionally, for various languages. A few instances of gematria in Arabic, Spanish and Greek, spelled with the Hebrew letters, are mentioned in the works of Rabbi Abraham Abulafia; some Hasidic Rabbis also used it, though rarely, for Yiddish. However, the primary language for gematria calculations has always been and remains Hebrew and, to a lesser degree, Aramaic.
 Textual sourcesA Mishnaic textual source makes clear that the use of gematria is dated to at least the Tannaic period.
Pirkei Avot 3:23:
רבי אלעזר בן חסמא אומר, קנין ופתחי נדה הן הן גופי הלכות. תקופות וגמטריאות פרפראות לחכמה.
Rabbi Eleazar Chisma said: the laws of mixed bird offerings and the key to the calculations of menstruation days—these, these are the body of the halakhah. The calculation of the equinoxes and gematria are the desserts of wisdom.An alternative translation to the Hebrew word פרפראות is "minor side dishes".
Minor dishes may be served before, during, or after a meal, to add interest and variety; they are the appetizers, side dishes, desserts, tid-bits — never to be served as main dishes. In other words, these sciences, while important, are yet only auxiliary and secondary. What is primary is the Torah. What is central is the life giving law.
 Values tableThe Mispar gadol (see below) values are:
 VowelsThe value of the Hebrew vowels is usually not counted, but some less known methods include the vowels as well. The most common vowel values are as follows (a less common alternative value, based on digit sum, is given in parentheses):
 MethodsThere are several methods used to calculate the numerical value for the individual words, phrases or whole sentences. More advanced methods are usually used for the most significant Biblical verses, prayers, names of God and angels etc.
- Mispar Hechrachi (absolute value) that uses full numerical value of the twenty-two letters. Sometimes its also called Mispar ha-Panim (face number), as opposed to the more complicated Mispar ha-Akhor (back number).
- Mispar Gadol counts the final forms (sofit) of the Hebrew letters as a continuation of the numerical sequence for the alphabet, with the final letters assigned values from 500 to 900.
- The same name, Mispar ha-Gadol, is also used for another method, which spells the name of each letter and adds the standard values of the resulting string.
- Mispar Katan calculates the value of each letter, but truncates all of the zeros. It is also sometimes called Mispar Me'ugal.
- Mispar Siduri (ordinal value) with each of the 22 letters given a value from one to twenty-two.
- Mispar Bone'eh (building value) uses the sum of each letter added to the next letter within the word to total the value of the word. Therefore, the value of the word "Achad" (one) is 1 + (1 + 8) + (1 + 8 + 4) = 23.
- Mispar Kidmi (triangular value) uses each letter as the sum of the all the standard gematria letter values preceding it. Therefore, the value of Aleph is 1, the value of Bet is 1 + 2 = 3, the value of Gimmel is 1+2+3=6, etc. It's also known as Mispar Meshulash (triangular or tripled number).
- Mispar P'rati calculates the value of each letter as the square of its standard gematria value. Therefore, the value of Aleph is 1 × 1 = 1, the value of Bet is 2 × 2 = 4, the value of gimmel is 3 × 3 = 9, etc. It's also known as Mispar ha-Merubah ha-Prati'.
- Mispar ha-Merubah ha-Klali is the square of the standard absolute value of each word.
- Mispar Meshulash calculates the value of each letter as the cube of their standard value. The same term is more often used for Mispar Kidmi.
- Mispar ha-Akhor The value of each letter is its standard value multiplied by the position of the letter in a word or a phrase in either ascending or descending order. This method is particularly interesting, because the result is sensitive to the order of letters. It's also sometimes called Mispar Meshulash (triangular number).
- Mispar Mispari spells out the standard values of each letter by their Hebrew names ("Achad" (one) is 1+8+4=13 etc.), and then adds up the standard values of the resulting string.
- Mispar Shemi (also Millui letter "filling"), uses the value of each letter as equal to the value of its name. For example, the value of the letter Aleph is (1 + 30 + 80) = 111, Bet is (2 + 10 + 400) = 412, etc. Sometimes the same operation is applied two or more times recursively.
- Mispar Ne'elam (hidden number) spells out the name of each letter without the letter itself (e.g. "Leph" for "Aleph") and adds up the value of the resulting string.
- Mispar Katan Mispari (integral reduced value) is used where the total numerical value of a word is reduced to a single digit. If the sum of the value exceeds 9, the integer values of the total are repeatedly added to produce a single-digit number. The same value will be arrived at regardless of whether it is the absolute values, the ordinal values, or the reduced values that are being counted by methods above.
- Mispar Misafi adds the number of the letters in the word or phrase to their gematria.
- Kolel is the number of words, which is often added to the gematria. In case of one word, the standard value is incremented by one.
- Atbash uses exchanges each letter in a word or a phrase by opposite letters. Opposite letters are determined by substituting the first letter of the Hebrew alphabet (Aleph) with the last letter (Tav), the second letter (Bet) with the next to last (Shin), etc. The result can be interpreted as a secret message or calculated by the standard gematria methods. A few instances of Atbash are found already in the Hebrew Bible. For example, see Jeremiah 25:26, and 51:41, with Targum and Rashi.
- Albam the alphabet is divided in half, eleven letters in each section. The first letter of the first series is exchanged for the first letter of the second series, the second letter of the first series for the second letter of the second series and so forth.
- Achbi divides the alphabet into two equal groups of eleven letters. Within each group, the first letter is replaced by the last, the second by the tenth, etc.
- Ayak Bakar replaces each letter by another one that has a 10-times-greater value. The final letters usually signify the numbers from 500 to 900. Thousands is reduced to ones (1000 becomes 1, 2000 becomes 2 etc.)
- Ofanim replaces each letter by the last letter of its name (e.g. "Fe" for "Aleph").
- Akhas Beta divides the alphabet into three groups of 7, 7 and 8 letters. Each letter is replaced cyclically by the corresponding letter of the next group. The letter Tav remains the same.
- Avgad replaces each letter by the next one. Tav becomes Aleph. The opposite operation is also used.
Some authors provide lists of as many as 231 various replacement ciphers, related to the 231 mystical Gates of the Sefer Yetzirah.
Dozens of other far more advanced methods are used in Kabbalistic literature, without any particular names. In Ms. Oxford 1,822, one article lists 75 different forms of gematria. Some known methods are recursive in nature and are reminiscent of the graph theory or use heavily combinatorics. Rabbi Elazar Rokeach often used multiplication, instead of addition, for the above-mentioned methods. For example, spelling out the letters of a word and then multiplying the squares of each letter value in the resulting string produces very large numbers, in orders of trillions. The spelling process can be applied recursively, until a certain pattern (e.g. all the letters of the word "Talmud") is found; the gematria of the resulting string is then calculated. The same author also used sums of all possible unique letter combinations, which add up to the value of a given letter. For example, the letter Hei, which has the standard value of 5, can be produced by combining 1 + 1 + 1 + 1 + 1, 2 + 1 + 1 + 1, 3 + 1 + 1, 4 + 1, 2 + 2 + 1 or 2 + 3, which adds up to 30. Sometimes combinations of repeating letters are not allowed (e.g. 2 + 3 is valid, but 3 + 1 + 1 is not). The original letter itself can also be viewed as a valid combination.
Variant spellings of some letters can be used to produce sets of different numbers, which can be added up or analyzed separately. Many various complex formal systems and recursive algorithms, based on graph-like structural analysis of the letter names and their relations to each other, modular arithmetic, pattern search and other highly advanced techniques, are found in the "Sefer ha-Malchuth" by Rabbi David ha-Levi of Draa Valley, a Spanish-Moroccan Kabbalist of the 15–16th century. Rabbi David ha-Levi's methods take into consideration the numerical values and other properties of the vowels as well.
Kabbalistic astrology uses some specific methods to determine the astrological influences on a particular person. According to one method, the gematria of the person's name is added to the gematria of his of her mother's name; the result is then divided by 7 and 12. The remainders signify a particular planet and Zodiac sign.
 Absolute valueThe most common form of gematria is used in the Talmud and Midrash, and elaborately by many post-Talmudic commentators. It involves reading words and sentences as numbers, assigning numerical instead of phonetic value to each letter of the Hebrew alphabet. When read as numbers, they can be compared and contrasted with other words or phrases - cf. the Hebrew proverb נכנס יין יצא סוד (nichnas yayin yatza sod, lit. "wine entered, secret went out", i.e. "in vino veritas"). The gematric value of יין ("wine") is 70 (י=10; י=10; ן=50) and this is also the gematric value of סוד ("secret", ס=60; ו=6; ד=4).
A classic Biblical commentary incorporating a great deal of gematria is Baal ha-Turim by Rabbi Jacob ben Asher.
Gematria is often used by the Maharal of Prague and hasidic Torah commentators (such as the "Sefath Emmeth" from Gur).
 Use in other languagesThe first attested use of gematria occurs in an inscription of Assyrian ruler Sargon II (727–705 BC) stating that the king built the wall of Khorsabad 16,283 cubits long to correspond with the numerical value of his name. Gematria or isopsephy was borrowed into the Greek probably soon after their adoption of the Semitic writing system. The extant examples of use in Greek come primarily for the Christian literature and, unlike rabbinic sources, is always explicitly stated as being used. It has been asserted[where?] that Plato (c. 427-347 BC) offers a discussion of gematria "in its simplest forms" in the Cratylus, where he is said to have claimed that "the 'essential force' of a thing's name is to be found in its numerical value, and that words and phrases of the same numerical value may be substituted in context without loss in meaning." A direct review of the Cratylus, however, shows that Plato made no such claim and that gematria is not discussed in it either explicitly or implicitly. What can be more accurately stated is that Plato's discussion in the Cratylus involves a view of words and names as referring (more or less accurately) to the "essential nature" of a person or object, and that this view may have influenced - and is central to - Greek gematria.
The Latin-script languages exhibit borrowing of gematria methods dating from the early Middle Ages after the use lapsed following the collapse of the Roman Empire in the 5th century.
Many researchers connect the "Number of the Beast", referred to in the Book of Revelation of the New Testament, with either Greek or Hebrew gematria as used by the early Christians. According to such interpretations, the number in question, 666, was originally derived via gematria from the name of the Roman emperor of the time, Nero Caesar (נרונקסר Nero Qasr).
 See also
- Benjamin Blech, "The Complete Idiot's Guide to Jewish Culture", p. 395 (2004)
- "Gematria" at Dictionary.com
- e.g. Aish HaTorah, http://www.aish.com/spirituality/prayer/Prayer_6_-_Hear_O_Israel_Part_1.asp, which says "It is part of a Kabbalistic tradition ... Gematria is a Kabbalistic way of showing how two ideas are related on a conceptual level; it is using numerology as basis to confirm (not create) the connection."
- Otzar Eden ha-Ganuz,
- E.g. the rebbes of the Zhidichov dynasty noticed that the Yiddish word vaser (water) has the same value as Geshem (rain in Hebrew), and used this fact for theurgic meditations
- astronomer and mathematician and knew geometry, Horayoth 10 a-b
- Bunim, I (1964). "Ethics From Sinai", Feldheim
- Sefer ha-Malchut, "Sifrei Chaim", Jerusalem, 2008
- the spelling of the name of the number comes from the Talmud
- The Jewish Encyclopedia, Volume 5. New York: Funk & Wagnalls Co. 1904. p.589.
- Moshe Cordevero, Sefer Pardes ha-Rimonim, שער האותיות
- Elazar Rokeach, Sefer ha-Shem
- Encyclopedia Judaica, 2007, vol. 7, 426
- Commentary to Sefer Yetzirah, attributed to Saadia Gaon, 6:4; Rabbi Aryeh Kaplan, Sefer Yetzirah, "WeiserBooks", Boston, 1997, pp. 220-221
- Babylonian Talmud, tractate Sanhedrin 38a, see of Zuckermann, Ghil'ad (2006), "'Etymythological Othering' and the Power of 'Lexical Engineering' in Judaism, Islam and Christianity. A Socio-Philo(sopho)logical Perspective", Explorations in the Sociology of Language and Religion, edited by Tope Omoniyi and Joshua A. Fishman, Amsterdam: John Benjamins, pp. 237-258.
- p.197, Ratzan
- p.164, Davies & Allison
- Marc Hirshman, Theology and exegesis in midrashic literature, in Jon Whitman, Interpretation and allegory: antiquity to the modern period. Brill, 2003. pp. 113-114.
- John Michell, The Dimensions of Paradise: Sacred Geometry, Ancient Science, and the Heavenly Order on Earth, 2008. pp.59-65 ff.
- Sanders, H. A. "The Number of the Beast in Revelation." Journal of Biblical Literature 37.1 (1918): 97.
- Gesenius' Hebrew Grammar, §5b and §5n
- Klein, Ernest, Dr., A comprehensive etymological dictionary of the English language: Dealing with the origin of words and their sense development thus illustrating the history and civilization of culture, Elsevier, Oxford, 7th ed., 2000
- Davies, William David & Allison, Dale C., A Critical and Exegetical Commentary on the Gospel According to Saint Matthew, Continuum International Publishing Group, 2004
- Acres, Kevin, Data integrity patterns of the Torah: A tale of prime, perfect and transcendental numbers, Research Systems, Melbourne, 2004 
- Clawson, Calvin C., Mathematical Mysteries: The Beauty and Magic of Numbers, Perseus Books, 1999
- Ratzan, Lee, Understanding Information Systems: What They Do and why We Need Them, ALA Editions, 2004
- Genesis Rabbah 95:3. Land of Israel, 5th Century. Reprinted in, e.g., Midrash Rabbah: Genesis. Translated by H. Freedman and Maurice Simon. Volume II, London: The Soncino Press, 1983. ISBN 0-900689-38-2.
- Deuteronomy Rabbah 1:25. Land of Israel, 5th Century. Reprinted in, e.g., Midrash Rabbah: Leviticus. Translated by H. Freedman and Maurice Simon. Volume VII, London: The Soncino Press, 1983. ISBN 0-900689-38-2.
- DVD 'Unlocking Da Vinci's Code – Mystery or Conspiracy?', Highland Entertainment, 2004. ISBN 634991203821
- Lawrence, Shirley Blackwell, The Secret Science of Numerology – The Hidden Meaning of Numbers and Letters, New Page Books, 2001
- Hughes, J. P., Suggestive Gematria, Holmes, 2008
 Further reading
- Bernal, Martin. Cadmean Letters: The Transmission of the Alphabet to the Aegean and Further West before 1400 B.C. Winona Lake: Eisenbrauns, 1990.
- Cajori, Florian. A History of Mathematical Notations (2 vv.). Chicago: Open Court, 1928–9.
- Contenau, Georges. Everyday Life in Babylon and Assyria, New York: St. Martin's Press, 1954.
- Davis, John J. Biblical Numerology. Grand Rapids, MI: Baker Books, 1968.
- Diringer, David. The Alphabet: A Key to the History of Mankind (2 vv.). New York, Funk & Wagnalls, 1968.
- Diringer, David. The Story of the Aleph Beth. New York: Thomas Yoseloff, 1960; World Jewish Congress, 1958.
- Fideler, David. Jesus Christ: Sun of God: Ancient Cosmology and Early Christian Symbolism. Quest Books, 1993.
- Ifrah, Georges. From One to Zero: A Universal History of Numbers, Viking, 1985.
- Lawrence, Shirley Blackwell. The Secret Science of Numerology – The Hidden Meaning of Numbers and Letters. Franklin Lakes, NJ: New Page Books, 2001.
- Menninger, Karl. Number Words and Number Symbols: A Cultural History of Numbers. Cambridge: MIT Press, 1969.
- Naveh, Joseph. Early History of the Alphabet: An Introduction to West Semitic Epigraphy and Paleography. Jerusalem: The Magnes Press, The Hebrew University, 1987.
- Parpola, Simo. "The Assyrian Tree of Life: Tracing the Origins of Jewish Monotheism and Greek Philosophy." Journ. Near Eastern Studies 52, 3 (July 1993), 161–208.
- Rawn, Jonathan D. Discovering Gematria: Foundational Exegesis and Primary Dictionary. 1,968 pp. Gematria Publishing, 2008.
- Swiggers, Pierre, Transmission of the Phoenician Script to the West, in Daniels and Bright, The World's Writing Systems, 1996
- WebGim – An interactive gematria calculator, which includes results from Torah verses. (Hebrew)
- Simple English gematria calculator (gives the normal sum, plus the single digit number)
- Peter's Gematria Site – examines the application of gematria to the European languages from the Medieval period onwards, particularly in respect to esoteric communities, such as the Freemasons.
- Letters of several alphabets and their numerical amounts
- Gematria calculator, finds match to Biblical verses (in Hebrew)
- The Gematria Database at Esoteric Delights is a large online gematria database (over 235,000 translations) of the Hebrew–English dictionary, along with tools for transliteration and translation, geared towards English-speaking esoteric communities.