ESI, Esi, or esi may refer to:
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Chemistry
- Electrospray ionization, a technique used for mass spectrometry
Companies and organizations
- Electro Scientific Industries (ESI; Nasdaq: ESIO), a high-technology company based in Oregon, United States
- Employees’ State Insurance scheme, the national health and disability insurance for industry workers and other employees in India
- Erwin Schrödinger Institute for Mathematical Physics, an Austrian research institute
- ESI International, formerly Educational Services Institute, a workforce training firm based in Virginia, United States
- European Software Institute, a non-profit foundation launched as an initiative of the European Commission
- Express Scripts Incorporated, a pharmacy benefit manager
- Ernst Strüngmann Institute, a German research institute
Computer science
- Edge Side Includes, a markup language for edge level dynamic web content assembly
- Electronically Stored Information
- Enclosure Services Interface, a computer protocol used in SCSI enclosures
- ESI register, Extended Source Index register in the x86 microprocessor architecture
- Enterprise Systems Integration, a B2B functionality
- Enterprise Semantic Intelligence, a semantic search platform
Emergency medicine
- Emergency Severity Index, a triage algorithm for the hospital emergency department
Others
- esi is the ISO 639-3 code for the North Alaskan Inupiat language
- Earth Similarity Index
- Electromagnetic source imaging
- Environmental Seismic Intensity scale
- Environmental Sustainability Index
- Environmental Sensitivity Index, from (NOAA).
- Epidural Steroid Injection
- Escadron spécial d'intervention, Belgium's former counter-terrorism force, now the Federal Police Special Units
- Espinosa, Minas Gerais, Brazil airport IATA code
- Ethical Sensory Introvert, in socionics
- Export substitution industrialization (ESI), sometimes called Export-Oriented Industrialisation (EOI), an economic trade policy
Esi may refer to :
- Esi Tonga (1988-), a rugby league player