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Katherine Chernick Fauvre and David W. Fauvre created and trademarked the term Tritype®. The Tritype concept evolved from Oscar Ichazo's trifix concept. Tritype basically looks at an individual in terms of three types. An individual identifies the dominant type from each center (i.e., one type from the gut center: 891, one type from the heart center: 234, and one type from the head center: 567). A preferential order to those three types is also identified.

For example, an individual may identify type 1 as the gut type, type 3 as the heart type, and type 5 as the head type. Of those three types, the preferential order may be type 5 first, type 1 second, and type 3 third (indicated as 5-1-3).

Additional forms of Tritype are sometimes used as well such as Tritype Archetype which disregards the preferential order and Tritype with Wings which adds the preferred wing to each of the three types.

Here's a free test to help determine Tritype with Wing Preference.