TSO

Tso or tsho transliterate a Tibetan word for lake.
TSO is a three letter abbreviation commonly used to represent:

In science and technology

• TCP segmentation offloading, a technique for increasing outbound throughput of high-bandwidth network connections
• Technical Standard Order, a minimum performance standard issued by the FAA for certain items used on civil aircraft
• Time Sharing Option, an interactive command line interpreter for IBM mainframe operating systems OS/360, SVS, MVS, OS/390 and z/OS
• Transmission system operator - a entity involved in electric power transmission or transmission of natural gas
• Trichuris suis, eggs of the swine whipworm
• Technical Safety Organisations, organisations which deliver services supporting the national nuclear regulatory authorities, in the field of nuclear and radiation safety.
• Threefold Social Order a sociological theory involving the relationship of economy, polity and culture

In music

• Taipei Symphony Orchestra
• Tasmanian Symphony Orchestra
• The Summer Obsession
• Tokyo Symphony Orchestra
• Toledo Symphony Orchestra
• Toronto Symphony Orchestra
• Trans-Siberian Orchestra

Organizations

• A local sorority at Knox College in Galesburg, Illinois
• The Stationery Office, British publishers
• Travaux du Sud-Ouest, a French transportation company
• Tactical Systems Officer (naval submarine posting)

Games

• The Sims Online, a massively multiplayer game (now named EA Land)

People

• José Mourinho, a former Chelsea and FC Porto manager whose nickname is "The Special One"
• Zuǒ Zōngtáng (左宗棠), known simply as General Tso
• Theodore Ts'o, a software developer mainly known for his contributions to the Linux kernel

Other

• Transportation Security Officer, federal employees of the Transportation Security Administration, a division of the U. S. Department of Homeland Security
• The Sacred Octagon, the bi-monthly journal of the New England MG T Register (an organisation of MG enthusiasts)
• The ICAO airline designator code for Transaero
• Tresco Heliport IATA Airport Code
• Total Shares Outstanding, a financial term referring to the stock held by investors, including restricted shares, as well as those held by the public
• Tourist Standard Open, a type of British Railways coach
• Marcos TSO, a sports car manufactured by Marcos Engineering Ltd.
• Tactical Situation Object, a proposed European standard for exchanging information during emergency and disaster management.