Entry: pennons (n.)
In context: "There's a maple-leaf flag and a 50-star U.S.A. flag hanging limp off brass poles on either side of the window; in an extreme corner are fleur-de-lis pennons on tall sharp polished sticks."
Definition: A long narrow triangular or swallow-tailed flag, usually attached to the head of a lance or a helmet, originally the ensign of a knight under the rank of banneret, and later the military ensign of lancer regiments. Now chiefly hist.
Other: In extended use: any flag or banner. Also fig.
Source: Oxford English Dictionary