Monogram Flags & Banners
Monogram Flags & Banners are one of the most popular outdoor flag styles. Monograms first appeared on Greek coins used as early as 350 BC. The letters stood for the cities that issued the coins. Since then, the monogram style has been used as signatures by artists and craftsmen, royal insignia's, acts of rebellion, Corporate logos, and for personal decorations.
Check out the Monogram Wiki
for examples of historical monograms.