Etymology
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pennon (n.)

"long, narrow flag" (often triangular or swallow-tailed, attached to a lance and having distinguishing markings), late 14c., penoun, from Old French penon "feathers of an arrow; streamer, flag, banner," from penne "feather," from Latin penna "feather" (from PIE root *pet- "to rush, to fly"). In medieval Europe, the flag of a knight-bachelor or one who has not reached the dignity of a banneret.

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Definitions of pennon

pennon (n.)
a long flag; often tapering;
Synonyms: pennant / streamer / waft
pennon (n.)
wing of a bird;
Synonyms: pinion
From wordnet.princeton.edu