or '''SAS''' may refer to:
- Small-angle Scattering (SAS) , a scattering technique based on the deflection of a beam of particles away from the straight trajectory after it interacts with a sample
- Spatially Aware Sublayer, an optional sublayer of the MAC that provides spatial reuse in Resilient Packet Ring
- Software As A Service
- SAS System , a software package used, amongst other things, for statistical analysis
- Serial Attached SCSI , a computer bus technology primarily designed for the transfer of data to and from storage devices, e.g. hard disks
- Short Authentication String
- Space Activity Suit , a spacesuit which provides mechanical pressure by means of elastic garments
- Space Adaptation Syndrome , an illness akin to motion sickness experienced by many first-time space travelers
- Safety And Automation System , a system which performs monitoring, logic control and safeguarding of an oil and gas plant
- Solvent Accessible Surface , the surface area of a biomolecule (protein, DNA, etc.) that is accessible to a solvent.
- Synthetic Aperture Sonar , a form of sonar in which sophisticated post-processing of sonar data are used in ways closely analogous to synthetic aperture radar
- Slot Accounting System (SAS) protocol, a slot machine communication method created by the International Gaming Technology ( IGT ) corporation.
- School Of Advanced Study , a listed organization of the University Of London with ten member institutes.
- School For Advanced Studies , a dual-enrollment high school program in Miami, Fl
- Schools Advisory Service
- Semester At Sea , a shipboard academic program administered by the University of Virginia
- Shanghai American School , an international school in Shanghai
- Singapore American School , an international school in Singapore
- Slovak Academy Of Sciences , the main scientific and research institution in Slovakia fostering basic and strategic basic research
- Society For Amateur Scientists , an American organisation
- Space Access Society , an organization dedicated to increasing the viability and reducing the cost of commercial access to space travel
- Studia Academica Slovaca , a summer school teaching the Slovak language
- Society For Animation Studies , an international scholarly organisation
- St. Augustine's School , a school in Kalimpong, West Bengal, India
- Strong American Schools , the nonprofit running "ED in 08," an information and advocacy campaign aimed at brining education reform to the forefront of the 2008 presidential candidates' campaign policies
- Sussex Archaeological Society
- SAS-7 , a television station in Adelaide, Australia
- SAS Institute Inc., a software company
- SAS Shoemakers , a shoe company
- Scandinavian Airlines System , an airline company in Denmark, Norway and Sweden
- SAS Braathens , an airline company in Norway
- SAS Group , an airline and hotel company in Europe, based in Stockholm, Sweden
- SAS Cargo Group , a cargo company in North Europe
- Statements On Auditing Standards , a series of internationally recognized auditing standards
- --- SAS 70 , defines the professional standards used by a service auditor
- --- SAS 99 , defines the professional standards used by auditors in relation to fraud
- Radisson Hotels , branded Radisson SAS in parts of Europe, Africa, and Asia
- Surfers Against Sewage , UK-based environmental campaign group
- SAS System , originally Statistical Analysis System, software and a programming language created by the SAS Institute
- SAS (browser) , a microbrowser
- SAS (Action Force) , a fictional military unit in the ''Action Force'' universe
- SAS Strategic Methodology
- Self-anchored Suspension Bridge , a suspension bridge in which the main cables do not attach to the ground via large anchorages
- Short attention span, have a limited Attention Span
- Side-Angle-Side , a formula used to prove the congruence of two triangles
- Surplus Activated Sludge , a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc
- '' Société Par Actions Simplifiée '', a type of corporation in France
- Squamish Access Society , an organisation working to protect access to rock climbing areas in and around Squamish, British Columbia , Canada
- ‘LSE SAS’ is a colloquial term, deriving from central London to describe a group of people whose mutual ties monitor ‘carnage’ levels.
- Spy novel series ''SAS'' by Gérard De Villiers
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