An STI, or a sexually transmitted infection, is an infection transmitted through human sexual behavior.
STI, sti, or Sti may also refer to:
Science and technology Biology and psychology Signal transduction inhibitor, a class of pharmaceutical compounds Soft tissue injury, the damage of muscles, ligaments and tendons throughout the body Symptom targeted intervention, a treatment model for depression
Electronics and computing Shallow trench isolation, an integrated circuit STI (x86 instruction), a flag bit in the CPU relating to interrupts Still Image Architecture, an image scanner API
Other uses in science and technology Shimano Total Integration, a gearshift system for bicycles Speech transmission index, a measure of transmission quality Stationary target indication, a mode of radar operation Subaru Impreza WRX STI, a motor vehicle Verkehrsbetriebe STI, a bus operator in the Swiss canton of Bern
Businesses and organizations Educational organizations Sail Training International, an international maritime education charity STI College, a private college in the Philippines
In science and technology Semantic Technology Institute International, a research institute in Vienna, Austria Sega Technical Institute, a video game developer Subaru Tecnica International, the motorsports division of Subaru Sony, Toshiba, and IBM, co-developers of the Cell microprocessor
Other businesses and organizations Sangha Theravada Indonesia, one of various modern Buddhist organizations that still survive Scottish Trade International (1991-2001), later Scottish Development International Canadian airline Sontair, an ICAO code; see List of airline codes (S)
Other uses Straits Times Index, a Singaporean stock market index Stirlingshire, a historic county in Scotland Cibao International Airport, an IATA code Shun Tin station, an MTR code Bulo Stieng language, an ISO 639-3 code
See also ST1 (disambiguation)