EPI or Epi may refer to: Science and technology Mathematics Epigraph (mathematics) Epimorphism Entropy power inequality, a result that relates to so-called "entropy power" of random variables Extreme physical information, a principle in information theory Medicine and health Echo-planar imaging Epidemiology Epinephrine, a neurotransmitter Epinephrine (medication) Epi-pen Exocrine pancreatic insufficiency, the inability to properly digest food due to a lack of digestive enzymes made by the pancreas Expanded Program on Immunization, a World Health Organization program Biology Epidendrum, an orchid genus Epiphyllum hybrid, a cactus hybrid Technology Episerver, a global e-commerce company Epitaxy, a semiconductor fabrication technique European Processor Initiative, a European project to build new low-power processors Other sciences Eletrophotonic imaging, an imaging technique Epimer, one of a pair of diastereomers Places Epi (island), in Vanuatu Portuguese India, also known as the Portuguese State of India (Portuguese: Estado Português da Índia) People Enkhjargal Dandarvaanchig (born 1968), Mongolian musician Epi Taione (born 1979), Tongan rugby union footballer Juan Antonio San Epifanio (born 1959), Spanish basketball player Organisations Ecology Project International, an American environmental organization Economic Policy Institute, an American economic think tank Education Policy Institute, a British education think tank European Patent Institute, the professional association of European patent attorneys European Payments Initiative, a pan-European payment system Language EF English Proficiency Index, a ranking of countries by their English skills Epi languages, a family of languages spoken on Epi island Other uses Environmental Performance Index, quantifier of the environmental effect of a state's policies Ends per inch, the number of warp threads per inch of woven fabric Ethical positioning index, an index which measures how ethically a brand is positioned Exploding Plastic Inevitable, a series of multimedia events by Andy Warhol See also