TSO
# TSO

TSO may refer to:

## Science and technology

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

### Computing

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

## Music

* Taipei Symphony Orchestra
* Tasmanian Symphony Orchestra
* Tehran Symphony Orchestra
* The Summer Obsession
* Tokyo Symphony Orchestra
* Toledo Symphony Orchestra
* Toronto Symphony Orchestra
* Trans-Siberian Orchestra
* Tucson Symphony Orchestra

## Transportation

* Transaero Airlines (ICAO airline designator code), a former Russian airline
* Tresco Heliport (IATA airport code), a former heliport in the Scilly islands
* 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

## Other uses

* 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
