flagship

/ˈflægʃɪp/ noun [C]

Definition

› the best or most important product, idea, building, etc. that an organization produces or owns: This machine is the flagship in our new range of computers. The company's flagship store is in New York.

› a company that is one of the most important in a particular area or industry: The bank is the retail and commercial banking flagship of the TSSA Financial Holdings Ltd. Tata Steel is the flagship company of the Tata Group.

(Definition of flagship noun from the Cambridge Business English Dictionary © Cambridge University Press)