Omron Rings
An image consisting of rings of the same diameter (about 1 mm) printed by offset. They form a certain structure composed of five Omron rings, one of which is the Eurion constellation. The rings are geometrical marks used for copy protection (fig. 1).
![](https://static-content.regulaforensics.com/Glossary/Banknotes/N-R/Omron_Rings_01.webp)
Fig. 1. Omron Rings. 500 Euro (2002)