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A scatter of small rings on a banknote that scanners refuse to copy.
Also known as: Omron rings, Little circles on a banknote, Pattern of five circles
Five small circles in a repeated arrangement, hidden in the ornament of most modern banknotes. Copiers and image software detect the pattern and decline to reproduce the note — a machine-readable mark that exists to be found by machines and ignored by people.
A pattern of five small rings, repeated in varying orientations across the design of a banknote, which copiers, scanners and image-editing software detect in order to refuse reproduction.
Contexts: Public information
Named for the yellow rings on the €20 note where it was first identified publicly, and present on the currencies of a great many issuers who have never formally acknowledged it.
Issuers generally neither confirm nor describe it, so this is a documented observation rather than a published specification.
Disguised as ornament — musical notes, flower centres, decorative dots — so that a note looks designed rather than marked, which is why almost nobody notices it.
Groups of five small rings scattered across the note's background, each group in a different orientation, worked into the surrounding ornament.
A fuller structured visual breakdown is not yet documented for this symbol.