Psi Index

The Psi Index is a system used by the Terran Confederacy and later the Terran Dominion to measure the psionic ability of terrans, a PA Profile having to be established within nine months of birth for all children born within the territory of the former. Under the Dominion, the same system was also used to measure the psionic ability of gestalts-protoss/terran hybrid soldiers.

People with low levels of psychic power can often detect its use, and some can even resist telepathy. A PI rating of 4.5 is too low to reliably project thoughts, and a person with that low a rating is not referred to as a "teep".

The PI score was completely readjusted after Sarah Kerrigan was brought to the new Ghost Program, as she had reached unheard-of levels, forcing this change.

Known Ratings

 * Kerrigan (12) (In WoL the adjutant states Infested kerrigan as a class 12 psyonic being)
 * Nova (10)
 * Agent X81505M (8)
 * Colin Phash (7.5)
 * Gestalt Zero (7+)
 * Aal Cistler (4.5)
 * Malcolm Kelerchian (3.5)