A paper size approximately 17.7 × 22.4 inches, historically used in France for printing and publishing.
From French 'colombe' (dove), possibly because the watermark featured a dove. It's a traditional European paper size that predates the modern metric system.
Before standard paper sizes existed, printers named sizes after watermarks and symbols—'colombier' with its dove watermark was fancy enough for important documents, like when your printer has 'premium' settings now.
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