SOI or soi or variation may refer to:
Technology
- Silicon on insulator, in semiconductor manufacturing
 - Signal operating instructions
 - Service-oriented infrastructure
 - Stages of involvement for safety-critical software and hardware, US FAA
 
Science
- Southern Oscillation Index
 - Sphere of influence (astrodynamics)
 - Second-order intercept point, a measure of linearity that quantifies second-order distortion generated by nonlinear systems and devices
 
Soi
- A soi is a side-street branching off a major street in Thailand.
 - Soi (surname), a surname
 - Soi language, an Iranian language
 - Chua Soi Lek (born 1947), Malaysian politician
 
Other uses
- Sociosexual Orientation Inventory
 - School of Infantry
 - Severity of illness
 - Solomon Islands, UNDP country code
 - Sphere of influence, in politics
 - Symphony Orchestra of India
 - Stars on Ice, a skating tour
 - Statistics of Income of the US Internal Revenue Service
 - Shadow of Israphel, a Minecraft series by The Yogscast
 
See also
- All pages with titles beginning with SOI
 - All pages with titles beginning with SoI
 - All pages with titles beginning with Soi
 - All pages with titles containing Soi
 - Pou-Soi
 - Soy (disambiguation)
 - SOJ (disambiguation)
 - Soja (disambiguation)
 - Soya (disambiguation)
 - Soia (disambiguation)
 
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