ESI

• Earth Similarity Index • Electrospray ionization, a technique used in mass spectrometry • Environmental Seismic Intensity scale • Essential Science Indicators, by Clarivate • Electronic supplementary information, in scientific publications; for example see coordination polymerization Computing • Edge Side Includes, a markup language • Electronically stored information (Federal Rules of Civil Procedure) • Enterprise Southbridge Interface, a motherboard interface • ESI register, in the x86 microprocessor architecture Medicine • Electromagnetic source imaging • Emergency Severity Index, a triage algorithm • Epidural steroid injection ==Organisations==

• Electro Scientific Industries, an American high-technology company • Employees' State Insurance, in India • ESI Hospital metro station, Delhi • ESI Hospital metro station (Hyderabad) • Ernst Strüngmann Institute, a German research institute • Erwin Schrödinger International Institute for Mathematical Physics, in Austria • Escadron spécial d'intervention, now the Belgian Federal Police Special Units • European Stability Initiative, a think tank • ITT Educational Services, owner of the defunct ITT Technical Institute ==People==

• Esi Awuah, Ghanaian academic • Esi Benyarku (born 1976), Canadian sprinter • Esi Buobasa, Ghanaian activist • Esi Edugyan (born 1978), Canadian novelist • Esi Lufo (born 2001), Albanian footballer • Esi Sutherland-Addy, Ghanaian academic • Esikeli Tonga (born 1988), Australian rugby league player ==Other uses==

• Enhanced Station Initiative, of the New York City Subway • Enlightened self-interest, a philosophy in ethics • Environmental Sustainability Index • Ethical Sensory Introvert, in socionics • Export substitution industrialization • Early supplier involvement, an aspect of supplier integration in new product development • North Alaskan Inupiatun language (ISO 639-3 code)