Sei or SEI may refer to:
Arts
- Sei (album), by Brazilian singer and composer Nando Reis
- "Sei", the title-song and first single from that album
- Sei (film), a 2018 Tamil thriller film
Organizations and companies
- 7-Eleven, a popular multinational chain of gas stations and convenience stores
- Safety Equipment Institute, a private, non-profit organization established to test safety and protective products
- Scottish Episcopal Institute, the theological college of the Scottish Episcopal Church
- Script Encoding Initiative, a department at UC Berkeley supporting proposals for minor and historic scripts in the Unicode Standard.
- Scuba Educators International, a non-profit diver training organization
- SEI Investments Company, a financial services company headquartered in the United States
- Slough Estates International, the former name for Segro
- Smith Enterprise, a firearm and accessory manufacturing facility based in Tempe, Arizona that is known for making flash suppressors, muzzle brakes, sound suppressors, M14 rifles and accessories for M14 rifles.
- Software Engineering Institute, a federally funded research and development center at Carnegie Mellon University
- SpaceWorks Enterprises, a small aerospace engineering company in the United States
- Stockholm Environment Institute, a non-profit institute that specializes in sustainable development and environmental issues
- Sustainable Endowments Institute, a special project of Rockefeller Philanthropy Advisors, Inc, the Sustainable Endowments Institute (SEI) has pioneered research, education and outreach to advance resilient institutional responses to the climate crisis.
- Sumitomo Electric Industries, a manufacturer in automotive, information and communications, electronics, environment and energy, and industrial materials
- SUNY Eye Institute, a medical and basic sciences research institute in New York
People
- Given name
- Shō Sei (1497–1555), king of the Ryukyu Kingdom from 1526 to 1555
- Shō Sei (r. 1803), king of the Ryukyu Kingdom in 1803
- Sei Fujii (1882–1954), Japanese male immigrant rights activist in the United States
- Sei Hatsuno (born 1976), Japanese male writer of mystery and thriller novels
- Sei Ashina (born 1983), Japanese actress
- Sei Kawahara (born 1995), Japanese male figure skater
- A member of girl group Weki Meki
- Surname
- Indrek Sei (born 1972), Estonian freestyle swimmer
Other uses
- Sei whale, a baleen whale
- Se'i, traditional bacon from Timor, Indonesia
- Seebeck effect imaging, uses a laser to generate thermal gradients in conductors in order to locate electrically floating conductors
- Secondary electron image, a type of imaging in scanning electron microscopes to view sample topography
- Seri language, spoken in two Mexican villages
- Service endpoint interface, a term used in Java Platform, Enterprise Edition when exposing Enterprise JavaBean as web service
- Social-Emotional Intelligence (see Emotional Intelligence)
- Solid-electrolyte interphase (see Lithium-ion battery)
- Space Exploration Initiative, a plan envisioned by former U.S. President George H.W. Bush with crewed Moon and Mars missions
- Spanish East Indies, a former Spanish colony comprising the Philippines and most of Micronesia
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