GRADe can be easily understood as Grad, that is, the rate of change in a certain direction, and the operator ▽ acts directly on the function.

The DIVergence recorded as div is the divergence of the vector field, and the operator points are multiplied by the vector function. The flux of vector field passing through the outside of a closed surface is equal to the sum of divergence of the area surrounded by the surface. The passivity of vector field can be deduced from the divergence of 0.

Curvature is written as ROT, which is a vector function of the cross product of operator. The meaning is the average rotation intensity of the vector field along the normal vector, and the sum of the spinors of the vector field on the surface is equal to the positive cycle of the vector field along the boundary curve of the surface, that is, the line integral of the closed curve. A vector field with a spinor of 0 is called an irrotational field, and only such a field has a potential function, that is, a conservative field.