A Torque

1. (physics, mechanics) A rotational or twisting effect of a force; a moment of force, defined for measurement purposes as an equivalent straight line force multiplied by the distance from the axis of rotation (SI unit newton metre or Nm; imperial unit pound-foot or lb·ft, not to be confused with the foot pound-force, commonly "foot-pound", a unit of work or energy)

2. A tightly braided necklace or collar, often made of metal, worn by various early European peoples.

torque is the rotational Analogue of linear force. It is also referred to as the moment of force (also abbreviated to moment). It describes the rate of change of angular momentum that would be imparted to an isolated body.

\[\vec \tau =\vec r \times \vec F\]

\[\tau = rF \sin (\vec r, \vec F)\]