UNIT is a military organisation from the British science fiction television series Doctor Who, Torchwood, and The Sarah Jane Adventures. Operating under the auspices of the UN, its purpose is to investigate and combat paranormal and extraterrestrial threats to the Earth. In the original Doctor Who series, several UNIT personnel played a major role in the programme.

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In mathematics, an invertible element or a unit in a ring  refers to any element  that has an inverse element in the multiplicative monoid of, i.e. such element  that

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  1. A standard measure of a quantity.
    The centimetre is a unit of length.
  2. The number one.
    This pill provides 500 units of Vitamin E.
  3. An organized group comprising people and/or equipment.
    He was a member of a special police unit.
  4. A member of a military organization.
    The fifth tank brigade moved in with 20 units. (i.e., 20 tanks)
  5. Any military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization.
  6. An organization title of a subdivision of a group in a task force<ref name="JP102"/>.
  7. A standard or basic quantity into which an item of supply is divided, issued or used. In this meaning, also called unit of issue<ref name="JP102"/>.
  8. With regard to Reserve Components of the Armed Forces, denotes a Selected Reserve unit organized, equipped, and trained for mobilization to serve on active duty as a unit or to augment or be augmented by another unit. Headquarters and support functions without wartime missions are not considered units<ref name="JP102"/>.
  9. An element of a ring having a multiplicative inverse. (Formerly just the identity element 1R of a ring.)
  10. A volume of rock or ice of identifiable origin and age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.
  11. An item which may be sold singly.
    We shipped nearly twice as many units this month as last month.
  12. One kilowatt-hour (as recorded on an electricity meter).
  13. a measure of housing equivalent to the living quarters of one household, an apartment where a group of apartments is contained in one or more multi-storied buildings or a group of dwellings is in one or more single storey buildings, usually arranged around a driveway.


  1. For each unit.
    We have to keep our unit costs down if we want to make a profit.
  2. Having a size or magnitude of one.

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