flagship
noun [ C ]
uk/ˈflæɡʃɪp/ usthe 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.