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.
A person or thing of distinction.
Worthy of note; remarkable; memorable; noted or distinguished.
Easily noted (without connotations of value); clearly noticeable, conspicuous.
That can be observed; perceptible.