In heraldry, a shield or heraldic element that has been divided into compone sections; displaying a compone pattern.
From 'compone' as an adjective, with the suffix '-ed' indicating that something 'has the property of being compone.' It's a heraldic technical term describing visual arrangement.
Medieval heralds developed incredibly precise vocabulary—'componed' specifically means the checkerboard pattern has been applied to a shield, and they had dozens of such terms to describe every possible variation of design.
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