Extropy

The term extropy, coined by Tom Bell (T. O. Morrow) in January 1988, is defined as the extent of a living or organizational system's intelligence, functional order, vitality, energy, life, experience, and capacity and drive for improvement and growth. Extropy expresses a metaphor, rather than serving as a technical term, and so is not simply the opposite of entropy, although it is also considered the appropriate antonym. The concept of extropy is commonly invoked within some strains of transhumanism.

In the philosophy of digital probabilistic physics, the extropy of a physical system is defined to be the self-information of the markov chain probability of the physical system at a moment in time. This was to distinguish the probability of the markov state of the physical system from the probability defined by entropy which creates ensembles of equivalent microstates.