Numerology is any belief in the divine, mystical relationship between a number and one or more coinciding events. It is often associated with the paranormal, alongside astrology and similar divinatory arts.

There are various numerology systems which assign numerical value to the letters of an alphabet. Examples include the Abjad numerals in Arabic, the Hebrew numerals, Armenian numerals, and Greek numerals. The practice within Jewish tradition of assigning mystical meaning to words based on their numerical values, and on connections between words of equal value, is known as gematria.

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