(linear algebra) An identity matrix

Any standardized, reproducible unit that can be used to measure any physical property.

A unit of form, organization or arrangement of any size.

(chemistry) The basic structural unit of a polymer; the monomer unit which has been polymerized.

Any division of quantity accepted as a standard of measurement or exchange; a unit of measure.

(cinematography) The team that shoots footage which is of primary importance for the final cut of the motion picture, including all scenes involving actors, or at least stars of the motion picture.

(US) any unit of measurement that is currently used in the United States / any traditional unit of measurement that is used by custom

(cinematography) A separate team that shoots footage that is of secondary importance for the final cut of the motion picture, as opposed to first unit.

(anatomy) The structure consisting of hair, hair follicle, arrector pili muscle and sebaceous gland.

(geometry) A circle of radius 1. / (trigonometry, the unit circle) The circle of radius 1 with centre at the origin, used in defining trigonometric functions.