Hisab al-Jummal (Arabic Numerology)

Hisab al-Jummal (حساب الجُمَّل, "counting the sum") is an Arabic numerological system in which each of the 28 letters of the alphabet is assigned a numerical value from 1 to 1000.

What "abjad" means. The word "abjad" (أبجد) is a mnemonic of the first letters of the traditional alphabetical order: Alif-Ba-Jim-Dal (analogous to "alphabet" from Alpha-Beta). Abjad is the name of the letter ordering, not the numerological system.

Origins. Rooted in the Semitic tradition of recording numbers through the alphabet and inherited by the Islamic tradition, where it found extensive application in:

• Sufi mysticism — Ilm al-Huruf ("the science of letters")
• Divination — raml

Application

Numerical value of a word. The abjad letter ordering allows calculation of the numerical value of any word, name, or fragment of the Quran.

A famous example. The numerical value of the name "Muhammad" in a certain reading coincides with the value of phrases interpreted as indirect evidence of prophetic status.

Sufi practice. Uses Hisab al-Jummal for:

• Meditation on the Names of Allah (the 99 Names)
• Constructing numerical tables (wafq)

28 Letters = 28 Lunar Mansions

The letter–number–mansion link. The twenty-eight letters of the alphabet are linked to the twenty-eight lunar mansions (manzil al-qamar) — the Arabic system of lunar stations, an independent astrological tradition.

Multi-layered symbolism. This link letter–number–lunar mansion creates a multi-layered symbolic system in which the numerical value of a name is embedded within an astrological and cosmological context.

Place in Errarium

The numerology family. Within Errarium, Hisab al-Jummal represents the Arabic and Islamic numerological tradition alongside Hebrew gematria (#17), Pythagorean (#5), Chaldean (#29), and Vedic (#30) systems.

Uniqueness — living practice. Its unique distinction is its living rootedness in active religious practice: unlike systems that exist primarily as esoteric practices, Hisab al-Jummal continues to be used in Islamic spirituality and the folk culture of the Islamic world.