Curl

Curl[{f1, f2, f3}, {x1, x2, x3}] gives the curl of a 3D vector field.

Examples

Curl of a vector field:

Curl[{y, -x, 0}, {x, y, z}]
(* {0, 0, -2} *)

2D curl (scalar):

Curl[{-y, x}, {x, y}]
(* 2 *)

Please visit the official Wolfram Language Reference for more details.