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.
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.
where x is the position of the letter in the language letters index (Regular order of letters), and the floor and modulo functions are used.
The remainders signify a particular planet and Zodiac sign.
A Mishnaic textual source makes clear that the use of gematria is dated to at least the Tannaic period. Avot per Danby): 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 gematriot are the desserts of wisdom.
originated as an Assyro-Babylonian-Greek system of alphanumeric code or cipher later adopted into Jewish culture that assigns numerical value to a word, name, or phrase in the belief that words or phrases with identical numerical values bear some relation to each other or bear some relation to the number itself as it may apply to Nature, a person's age, the calendar year, or the like.
A single word can yield multiple values depending on the system used.