SOI
# SOI

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
