Pennons are small triangular flags, which were attached to the lances of knights to differentiate the noble milites from the other armoured cavalrymen in his medieval lance, the smallest tactical unit in the middle ages. The pennon typically repeated the tinctures and charges of the knight’s shield. The medieval guidon was a similarly designed, but much longer triangular flag, which served as the field sign of the formation. When a knight rose to the rank of knight banneret, the point of his pennon was cut off to turn it into a banner. This ceremony was called faire de pennon bannière.
The pennon differs from the pennoncel and the lance pennon in that it has a single point.
Professionally designed pennons for your miniature knights may be downloaded here.