TSO

TSO may refer to:

Science and technology

Transmission system operator, an entity involved in transmission of electric power or natural gas
Technical Standard Order, a minimum performance standard issued by the FAA for certain items used on civil aircraft
Trichuris suis, a species of whipworm, a parasite of pigs

Total store order, in memory ordering
Time Sharing Option, an interactive command line interpreter for IBM mainframe operating systems OS/360, SVS, MVS, OS/390 and z/OS
TCP segmentation offloading, a technique for increasing outbound throughput of high-bandwidth network connections

Tourist Standard Open, a type of British Railways loco-hauled coach
Trailer Standard Open, a type of British Railways coach
Marcos TSO, a sports car manufactured by Marcos Engineering Ltd
Transportation security officer, a federal employee of the Transportation Security Administration, a division of the U.S. Department of Homeland Security
Transaero Airlines, a former Russian airline (ICAO code: TSO)
Tresco Heliport, a former heliport in the Scilly islands (IATA code: TSO)

Threefold social order, a sociological theory involving the relationship of economy, polity and culture
The Sims Online, a massively multiplayer game
The Stationery Office, a British publisher
Total shares outstanding, the stock held by investors, including restricted shares, as well as those held by the public; see Shares outstanding