HEI

• HEI Hospitality, an American hotel owner and operator • Hawaiian Electric Industries, the largest supplier of electricity in the state of Hawaii • Health Effects Institute, a non-profit focused on the health effects of air pollution • HEICO, HEI is the stock symbol for HEICO Corporation == In education ==

• Higher education institution • Graduate Institute of International and Development Studies (French: ''''), in Geneva, Switzerland • Hautes études d'ingénieur, an engineering school in Lille, France ==In language==

• He (letter), the fifth letter of many Semitic alphabets • Heiltsuk-Oowekyala language, spoken in Canada == Places ==

• Heilongjiang, a province of China • Hei District, Chiba, a former administrative unit of Japan • Hei Glacier, in Antarctica • Hei River, in China • Heide–Büsum Airport, in Schleswig-Holstein, Germany • Heighington railway station, in England ==In science and technology==

• Healthy Eating Index, a measure of diet quality • High-efficiency incandescent, a type of incandescent light bulb • High energy ignition, an automotive ignition system • High explosive incendiary, a type of ammunition • Hot-carrier injection, a principle in the function of solid-state electronic devices • Human-environment interaction, or Environmental sociology ==Other uses==

• Hei (album), 2015 album by Norwegian duo Marcus & Martinus • Hei (Darker than Black), protagonist of the 2007 anime • Qi, in traditional Chinese culture, a principle forming part of any living thing (Cantonese: hei) ==See also==