Curl

In vector calculus, curl is a vector operator that shows a vector field

Vector field

In mathematics [i] a vector field is a construction in vector calculus [i] which associates a vector [i] ...

's rate of rotation

Rotation

Rotation is the movement of an object in a circular motion....

: the direction of the axis of rotation and the magnitude of the rotation. It can also be described as the circulation density. "Rotation" and "circulation" are used here for properties of a vector function of position; they are not about changes with time.

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In vector calculus, curl is a vector operator that shows a vector field

Vector field

In mathematics [i] a vector field is a construction in vector calculus [i] which associates a vector [i] ...

's rate of rotation

Rotation

Rotation is the movement of an object in a circular motion....

: the direction of the axis of rotation and the magnitude of the rotation. It can also be described as the circulation density.
"Rotation" and "circulation" are used here for properties of a vector function of position; they are not about changes with time.