Broad pennant
Encyclopedia
A broad pennant is a swallow-tailed tapering flag
Pennon
A pennon was one of the principal three varieties of flags carried during the Middle Ages . Pennoncells and streamers or pendants are considered as minor varieties of this style of flag. The pennon is a flag resembling the guidon in shape, but only half the size...

 flown from the masthead
Masthead
-Media:* the masthead , a list, usually found on the editorial page of a newspaper or other periodical, listing the publisher, editorial board, advertising rates, etc....

 of a ship to indicate the presence of a commodore
Commodore (rank)
Commodore is a military rank used in many navies that is superior to a navy captain, but below a rear admiral. Non-English-speaking nations often use the rank of flotilla admiral or counter admiral as an equivalent .It is often regarded as a one-star rank with a NATO code of OF-6, but is not always...

on board. It is so called because its dimensions are roughly 2:3.
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