** Engineer Unit

** Administration Unit

** United States Army Medical Unit ( 1956 – 69 )

** The Unit for Language and Communication

** London Road Safety Unit, which promotes safer roads through advertising and road safety measure.

** Community Safety, Enforcement and Policing, responsible for tackling fare evasion on buses, delivering policing services that tackle crime and disorder on public transport in cooperation with the Metropolitan Police Service's Transport Operational Command Unit ( TOCU ) and the British Transport Police.

** Freight Unit, which is currently developing the " London Freight Plan " and is involved with setting up and supporting a number of Freight Quality Partnerships covering key areas of London.

** Unit of observation, a type of entity ( e. g. person, house, neighborhood ) specifying the level at which data is collected

** Unit of analysis, a type of entity ( e. g. person, house, neighborhood ) specifying the level at which data is analyzed

** Moon Unit Zappa, American actress, musician and author

** Shirō Ishii, Japanese microbiologist and lieutenant general of Unit 731 ( d. 1959 )

** Bond County Community Unit School District 2

** Interdependent Occupational Unit

** After World War II Lambertsen called his 1940-1944 rebreather LARU ( for Lambertsen Amphibious Respiratory Unit ) but as of 1952 Lambertsen renamed again his invention and coins the acronym SCUBA ( for " self-contained underwater breathing apparatus ").

** Law & Order: Special Victims Unit ( 1999 – present ), also known as L & O: SVU

** VPI Extension Office-C. Taylor Clarke ( Unit Coordinator / ANR Extension Agent )

** Rescue 2 ( Special Operations Unit )

** Toshiba: MSX FM-synthesizer Unit ( no sample RAM, no MSX-Audio BIOS )

** UNTAET Force Headquarters Support Unit ( FHSU )/ Philippine Contingent to East Timor ( PhilCET )

** UNMISET Force Headquarters Support Unit ( FHSU )/ Philippine Contingent to East Timor ( PhilCET )

** Oketz Unit

** 1 x Incident Command Unit,

** Censorship Compliance Unit

** Crime Prevention Unit

** For every non-empty set S there is a binary operation defined on S that makes it a group.

** Parity flag in computing, indicates if the number of set bits is odd or even in the binary representation of the result of the last operation

** Space environment-study of conditions that affect the operation of spacecraft

** London Overground, although actual operation is undertaken by a private sector franchisee and maintenance by Network Rail.

** Docklands Light Railway: normally abbreviated DLR, this is the automatically driven light rail network in east London, although actual operation and maintenance is undertaken by a private sector franchisee.

** The present-day Hetch Hetchy Moccasin Powerhouse, rated at 100, 000 KVA, is completed and placed in operation.

** The Beijing Subway begins operation.

** The last trolleybus system in the United Kingdom closes in Bradford, West Riding of Yorkshire after over 60 years of operation.

** The Orient Express begins operation.

** The Indonesian military begins an operation in Aceh province.

** Unary operation

** Binary operation

** an operation is performed on the basis of an instruction

** Modulo operation

** Military operation, a military action ( usually in a military campaign ) using deployed forces

** Covert operation, an operation which conceals the identity of the sponsor

** Clandestine operation, an intelligence or military operation carried out so that the operation goes unnoticed

** Black operation, an operation that may be outside of standard military protocol or against the law.

** Sting operation, an operation designed to catch a person committing a crime, by means of deception