Meaning

noun a long flag; often tapering

noun wing of a bird

originFrom Late Middle English pennon, penoun (“long narrow flag attached to a lance or used in other contexts; one who bears a pennon, knight bachelor; plume of feathers; strip around the edge of a shield”), from Anglo-Norman penun (“feather of an arrow”), penoun (“flag attached to a lance”), Middle French pennon, penoun, and Old French penon (“flag attached to a lance”) (modern French pennon), from…

Etymology from Wiktionary, CC BY-SA 3.0