The phrase "brand flagship" refers to the main or most important store, location, or product of a particular brand. It is like the "star" or "headquarters" of the brand, representing its identity and showcasing its best offerings. Full definition
It's possible that the tech giant would be using the phrase in the promotional materials for the first Galaxy S branded flagship phone to come with a dual camera setup. (ibtimes.com)
And the first Huawei - branded flagship smartphone in quite some time. (androidheadlines.com)
Now in its 2018 model year, the 2018 Maserati GranTurismo takes its status as brand flagship more seriously than ever. (continentalmaserati.com)