Unit

The word unit means any of several things:

• Physical unit, a fundamental quantity of measurement in science or engineering
• Units (computer program), a popular program that does unit conversion.
• Functional unit, a component of a computer system such as the CPU.
• Unit of action, a discrete pice 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, a rock and roll album by the Australian band Regurgitator.
• In currency, a unit of money (a monetary unit).
• In a 19-inch rack a rack unit is a standard height of 1.75 inches.

• 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.

• Military units, including:
  • Unit 101, an Israeli special operations unit.
  • Unit 731, a secret unit of the Japanese army.