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
 * Soi, an error in the Microsoft Sam text to speech voice when saying "soy" or "soi".