There are several types of numerology. Here are some of the most well-known examples:
- The so-called Chaldean numerology (sometimes also referred to as Aramaic or ancient Hebrew numerology). In modern times, it has been represented by figures such as Cheiro, Linda Goodman, and Gerun Moore.
- Greek name numerology, or isopsephy, which was also adopted by the Pythagoreans.
- Pythagorean numerology, which has several subcategories. It was likely initiated by Philolaus, a follower of Pythagoras’ philosophy who lived about a century after him. The dominant branch today was influenced by L. Dow Balliett, with notable figures including Florence Campbell and Juno Jordan.
- Hebrew name numerology, or gematria. It was already used by Philo of Alexandria.
- Kabbalistic gematria. Its foundations are described in the late antique text Sepher Yetzirah.
- Arithmology, the analysis of names of people and concepts found in sacred texts, primarily those of Jewish and Christian Bibles. Key figures include Martianus Capella and Pietro Bongo.
- Greek gematria and Latin gematria as parts of arithmology.
- Arabic name numerology, or ‘ilm al-huruf, which also incorporates Islamic arithmological interpretations. Notable figures include Ibn Arabi, Al-Farabi, and Ahmad al-Buni.
- Within ‘ilm al-huruf, some Persian numerologists also contributed or developed their own models.
- Vedic numerology, with its most famous numerologist being Vararuci.
- Martinist numerology, represented by figures such as Martines de Pasqually, Louis-Claude de Saint-Martin, and Papus.
- Bagua, or spatial numerology of the eight directions.
- Yi Jing (I Ching) numerology, based on 64 hexagrams.
- Astro-numerological calendar-based school of the Nine Star Ki.
- Astro-numerological calendar-based school of Sizhu/Bazi (Four Pillars of Destiny). Its classical representative is Xu Ziping, after whom the main branch of this school is named.
- Astro-numerological calendar-based school of Zi Wei Dou Shu.
- Spatial numerology Fei Xing (Flying Stars), used in Feng Shui.
- Spatial numerology San He, a branch of Feng Shui.
- Spatial numerology San Yuan, another branch of Feng Shui.
- Spatial numerology of the Eight Mansions, or Ba Zhai, which is used in Feng Shui.
All these and other approaches have their own principles, which are sometimes compatible and sometimes not. For example, the Chaldean method shares several similarities with the Pythagorean school but has little to no connection with the Ba Zhai school.

