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Del followed by a cross, measuring rotation about a point.
Also known as: Rot, Rotor, Del cross, Curl operator
The cross after del is a cross product, so ∇×F returns a vector rather than a number, and that vector points along the axis the field is rotating about. British texts often write 'rot' instead, which is the same operator under a different abbreviation.
Denotes the curl of a vector field: the cross product of the del operator with the field, giving a vector at each point.
Contexts: Mathematics
Appears as 'rot F' in much European literature and older British work, from 'rotation'; 'curl' is Maxwell's term.
Contexts: Mathematics
An inverted triangle followed by a diagonal cross at mid-height, then the name of a field.