Final answer:
The group of people in similar positions from various companies referred to when using the center-of-influence method of networking is known as a Cross-Company Clique.
Step-by-step explanation:
When using the center-of-influence method of networking, the small, informal group of people that salespeople interact with, who often hail from various companies and communicate frequently both socially and professionally, is known as a Cross-Company Clique. This method of networking can be instrumental for professionals to exchange information, refer job opportunities, and support each other's business endeavors. By building trust and common interests, this clique becomes a valuable asset in navigating the professional landscape and can potentially lead to opportunities for advancements and collaborations.