Delta Quadrant species whose ritual for summoning spirits of fortune led the crew of the USS Equinox to the nucleogenic lifeforms they later exploited.
The Ankari practice a ceremony in which they use a device to call forth beings they regard as spirits of fortune, believed to bring good luck to those who summon them.
In Equinox, the crew of the stranded Starfleet ship Equinox learned the Ankari ritual. The spirits turned out to be nucleogenic lifeforms whose bodies could be converted into fuel, and Captain Ransom's crew began killing them to boost their warp drive, a crime that brought them into conflict with Voyager.