A decorative pattern of two or more interlaced curved lines forming a braided or twisted band, used in ornamental design and architecture.
From French guilloche, possibly derived from the name Guillaume or from Old French guille (a tool). The pattern may have been originally created with a specific decorative tool called a guilloche.
Guilloche patterns appear in ancient Roman mosaics, medieval manuscripts, and modern security documents like passports and currency—because interlaced patterns are actually hard to counterfeit by hand, making them perfect for anti-fraud design.
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