Koinoenergy
Koinoenergy is a form of energy.
The finger-like extensions of the cosmic cloud encountered by the USS Enterprise in 2269 consisted of a combination of koinoenergy, almost an ambiplasma, with an unusually powerful attraction force. (TAS: "One of Our Planets Is Missing")
Koinoenergy literally means "common energy". The "koino" prefix is sometimes used in science as a counterpart to "anti", for example with Koinomatter, the oposite of antimatter. Presumably, koinoenergy is used to distinguish from negative energy.