The phrase "sphere of influence" refers to a person's area, field, or domain of control or influence. Some possible synonyms for this term include "territory," "realm," "domain," "jurisdiction," "zone," "area of control," and "sphere of power." Other related terms might include "influence zone," "sphere of interest," "range of authority," "scope of influence," and "circle of power." These synonyms can be useful for expressing the same concept in different ways, or for emphasizing particular aspects of a person's sphere of influence, such as its physical extent, its level of authority, or its scope of impact on others.