flagship -
The most important one out of a related group.
Wikipedia
A flagship is the lead ship in a fleet of vessels, a designation given on account of being either the largest, fastest, newest, most heavily armed or, for publicity purposes, the best known. In military terms, it is a ship used by the commanding officer of a group of naval ships. The term originates from the custom of the commanding officer (usually, but not always, a flag officer) to fly a distinguishing flag.
OmegaWiki Dictionary
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flagship A ship led by the fleet commander.
flagship The most important one out of a related group.
