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 Styrene-oxide isomerase, an enzyme that catalyzes a chemical reaction

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".

See also

Pou-Soi Soy (disambiguation) SOJ (disambiguation) Soja (disambiguation) Soya (disambiguation) Soia (disambiguation)