The Enneagram describes NinePersonalityTypes. It is somehow similar to the MyersBriggs Type Indicator.
* http://www.wizvax.net/tap3x/EMBTI/journal.html
** ''(BrokenLink 2006-02-01)''
* http://www.enneagraminstitute.com/

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EnneaGram is also the name of a very good 9/8 instrumental written by Mont Campbell.