energy gradient
First derivatives of the total energy with respect to nuclear coordinates, i.e., negative values of forces on the nuclei. Evaluation of energy gradient plays a central role in searching potential energy surfaces for stationary points. A widespread technique is based on the minimization of the gradient norm (the square of energy gradient).
PAC, 1999, 71, 1919 (Glossary of terms used in theoretical organic chemistry) on page 1938