A valuable part of a company, especially one that is sought by another in a hostile takeover.
A prized possession or asset, originally one making up part of the royal regalia.
The most important one out of a related group.
The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag.
The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet.
To act as a flagship for.