Some banners featured various dags. Far more common in ancient times banners and found frequently in pre-heraldic means e.g. the Bayeux Tapestry, dagged banners apparently fell away from favor with the 13th century. The armorial banner is what we think of as being a flag these days, either square or https://miloqyire.blogrelation.com/40331271/the-fact-about-medieval-banners-and-flags-that-no-one-is-suggesting