The term 'Distinctive Flag' can be summarized by the crossword solution 'PENNON', which is a 6-letter word. PENNON is a type of flag that is long and narrow, often triangular or swallow-tailed in shape. It was used in the Middle Ages as a symbol of nobility and was flown from the mast or lance of a knight's horse. Pennons were also used to identify military units and were often decorated with heraldic symbols.