The instincts of the Enneagram types are self-preservation (sp), sexual (sx), and social (so). They are traditionally used to define three instinctual subtypes or variations of a basic type (e.g., SP 9, SX 9, and SO 9). One of these three subtypes is called the counter-type because it can look different from the basic type. Below are brief descriptions of the three type 9 instinctual subtypes.
SP 9 - Appetite, Collector: numbs oneself through eating, physical comfort, and routine activities; collects things and may have trouble deciding what to throw away; substitutes essential needs and wants with non-essentials.
SX 9 - Union, Fusion: sense of being comes from merging with significant others; can have difficulty individuating and standing on their own without reference to other; tendency to lose sight of own needs and desires in favor of other.
SO 9 - Participation (counter-type): participates in order to feel a part of the group; prioritizes group needs above their own and works hard toward those needs; fun-loving, sociable, congenial, doesn’t weigh others down with own woes.
While an individual may be identified with type 9 in general, that same individual may be more specifically identified with one of the three instinctual subtypes as well.
A more recent approach to using the instincts is instinctual variant stacking which can be used independent of Enneagram type.