SSO

Organizations

Sarasota County Sheriff's Office, a law enforcement agency in Sarasota County, Florida, US
Social Security Organization, a social welfare organization in Iran
Special Security Office, a function to disseminate sensitive information in the US federal government and armed forces
Special Security Organization, a former Iraqi security agency
Special Source Operations, a division of the US National Security Agency that collects digital data
Standards Setting Organization, a group developing, producing or maintaining technical standards
SSO VS, Russian Special Operations Forces (Sily Spetsial'nykh Operatsiy)
SSO ZSU, Ukrainian Special Operations Forces (Syly Spetsialʹnykh Operatsiy)
SSO, Belarusian Special Operations Forces
Society of Surgical Oncology

Starship Operators, a Japanese sci-fi novel and anime television series
Super Surgical Operation, a Japanese video game also known as Trauma Center: Under the Knife

Scaled Composites SpaceShipOne, the vehicle used in the first privately funded human spaceflight
Semi-synchronous orbit, a type of orbit
Single-stage-to-orbit, a reusable vehicle that reaches space without jettisoning hardware
Space Shuttle Orbiter, a reusable space vehicle formerly operated by NASA
Sun-synchronous orbit, a type of orbit
Swiss Space Office, national space program of Switzerland

Single sign-on, allowing access to multiple software systems using one login
Structure, sequence and organization, a US legal term relating to computer programs and copyright
Small string optimization

Simultaneous switching output, also known as simultaneous switching noise (SSN), or ground bounce

Sanitary sewer overflow, when untreated sewage is discharged into the environment
Senior station officer (New Zealand Fire Service), a rank in the New Zealand Fire Service
Source-separated organics, a system for separating compostable materials from other waste streams
Student Switch Off, a UK-based energy saving campaign
Sydney Star Observer, an LGBT newspaper in Sydney, Australia
South Sudan Oyee!, the national anthem of South Sudan.
Subsynchronous oscillations in an electrical grid