A horizontal line or stripe on a banner or flag; a border or decorative line on heraldic designs.
Compound noun: 'banner' + 'line.' This technical heraldic term combines the object (banner) with its visual feature (line), common in specialized art and design vocabulary.
Heraldic bannerlines followed strict rules—they had to be wide enough to see from a distance on a moving flag, which is why medieval heraldry looks so bold and graphic compared to modern flag designs.
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