pennon

noun

1. a distinctive flag in any of various forms, as tapering, triangular, or swallow-tailed, formerly one borne on the lance of a knight.
2. a pennant.
3. any flag or banner.
4. a wing or pinion.

noun

1. a long flag, often tapering and rounded, divided, or pointed at the end, originally a knight’s personal flag
2. a small tapering or triangular flag borne on a ship or boat
3. a poetic word for wing

n.long, narrow flag (often triangular or swallow-tailed), late 14c., from Old French penon “feathers of an arrow; streamer, flag, banner,” from penne “feather,” from Latin penna “feather” (see pen (n.1)).