The full form of SAS can refer to different things depending on the context:
Statistical Analysis System: A software suite used for advanced analytics, business intelligence, data management, and predictive analytics.
Special Air Service: A special forces unit of the British Army known for its high-level training and operations.
Scandinavian Airlines System: The flag carrier of Sweden, Norway, and Denmark, often referred to as SAS.
If you have a specific context in mind, please let me know!