Energy refers to the impetus behind all motion and all activity. It commonly describes the capacity to do work, a quantity that denotes the ability to do work and is measured in a unit dimensioned in mass × distance²/time² (ML²/T²) or the equivalent, and an intangible, modifiable force (often characterized as either 'positive' or 'negative') believed in some New Age religions to emanate from a person, place or thing and which is (or can be) preserved and transferred in human interactions; shared mood or group habit; a vibe, a feeling, an impression. (Compare aura.), which gives the term a broader and more practical sense than a single short definition would suggest. Depending on context, it can also point to a measure of how many actions a player or unit can take; in the fantasy genre often called magic points or mana, so the category can cover literal uses, related ideas, and more figurative extensions of the same core meaning. Taken together, these meanings present Energy as a flexible theme rather than a narrowly technical label, covering the central idea people usually mean when they use the word while still leaving room for closely related senses that appear in real language.
