Unit

From Wikipedia, the free encyclopedia

The word unit means any of several things:

• Unit (housing), in Australia/New Zealand - a self-contained suite of rooms within a set of similar dwellings.
• Units of measurement, a fundamental quantity of measurement
• Units (Unix), a command-line computer program that does unit conversion
• Units conversion by factor-label, a widely used approach for performing unit conversions
• A unit can be a general word for a module or device. For more specific example, see next entry.
• Functional unit, a component of a computer system such as the CPU
• A unit can refer to a self-contained section of a building (or maybe a structure such as a cabin) meant to be rented or otherwise occupied by a party, such as an apartment or business suite. See Apartment.
• In chemical engineering, a unit is a (usually) large vessel or section of a plant in which a unit operation goes on. See Chemical plant#Chemical processes.
• Unit of action, a discrete piece of action (or beat) in a theatrical presentation
• Multiple unit, a passenger train whose carriages have their own motors
• United Nations Intelligence Taskforce, a fictional entity in the Doctor Who television series
• Unit (album), an indie pop album by the Australian band Regurgitator
• Unit of alcohol, 10 millilitres of pure ethanol in the UK
• In biochemistry, unit is the measure of enzyme activity.
• In a 19-inch rack a rack unit is a standard height of 1.75 inches
• Military units, including:
  • Unit 101, an Israeli special operations unit
  • Unit 731, a covert medical experiment unit of the Imperial Japanese Army, which researched biological warfare through human experimentation during the Second Sino-Japanese War (1937-1945) and World War II
• G-Unit, a hip-hop music group
• The Unit, a television series
• A Strategic business unit
• In filmmaking, see second unit.

In mathematics:

• Unit vector, a vector with length 1
• Unit circle, the circle with radius 1 centered at the origin
• Unit interval, the interval of all real numbers between 0 and 1
• Imaginary unit, i, whose square is -1
• Root of unity, a complex number, a power of which is 1
• Unit (ring theory), an element that is invertible with respect to ring multiplication
• Unit type, a type that allows only one value
• In category theory, there is a natural transformation called the unit from the identity functor to the composition of two adjoint functors