Type Nine: A Study in Enneagram Subtypes 

This video explores the three subtypes of the Enneagram Type Nine using three main characters from Last Holiday, Harry Potter, and Chocolat.
From "The Complete Enneagram" by Beatrice Chestnut...
"...all three Type Nine subtypes express a need for fusion, but they fuse or merge with different things as a way of finding the comfort and connectedness they lack within themselves or with others. The Self-Preservation [Preserving] Nine fuses with physical comforts and activities, the Social [Navigating] Nine fuses with groups, and the Sexual [Transmitting] Nine fuses with other individuals."
Terminology differs between Enneagram teachers. Historically and today, most people refer to the Instinctual Variants/Biases as Social, Sexual, and Self-Preservation. Some substitute "One to One" for Sexual, although I personally think this mis-represents the nature of the Sexual "instinct", and is based more in an aversion/misunderstanding what "Sexual" actually means.
Teachers Mario Sikora and Maria Jose Munita of Awareness to Action use the alternate names of Navigating, Transmitting, and Preserving, which I think do a better job of capturing what each Instinct is actually going for.