Static equilibrium refers to a state where any object or system is present at rest and there are no forces acting on it. There are several synonyms for static equilibrium, including mechanical equilibrium, static balance, stationary state, and quiescent state. The term mechanical equilibrium refers to a state where an object is stable and balanced due to the absence of any external forces. On the other hand, the term static balance often denotes a system that is balanced without any motion. A stationary state indicates a state of an object or system that is motionless. Lastly, the term quiescent state denotes a state of inactivity where there is no change in the position or movement of the object or system.