What does the dot on the RMB mean?

These small circles are called Omron rings, which is the anti-counterfeiting technology of circle constellations. What is the recognition principle of this pattern is still a mystery. Omron ring is a pattern to prevent high-precision color copier, which is made up of five small circles arranged in the form of Orion. At present, this pattern recognition is preset in most copiers. Once this pattern is found, the copier will distort the output color or not directly output it.

Because Omron Ring has a very good effect of preventing counterfeit banknotes through color photocopiers, this technology has been adopted by major currencies in the world. Although there are so many rings on the banknote, there are not many Omron rings, usually only one, and the rest are obstacles made to disguise the Omron ring pattern.

Extended data:

Arranged in the form of Orion, it forms a constellation pattern called "Orion". Once the color copier finds this pattern, it will cause serious color distortion in the output and greatly improve the anti-counterfeiting function of paper money. This design is adopted by the world's major currencies such as US dollar, Euro, Japanese yen and RMB.

Since this technology was invented by Omron Corporation of Japan, these small circles are also called Omron rings, and obtained the US patent 5,845,008. When the Reserve Bank of India announced the rupee anti-counterfeiting feature, it called it Omron anti-copying feature, and this name was gradually adopted by the banknote printing industry and issuers.

Changjiang Net-The Secret You Don't Know: What's the use of the mysterious circle on the RMB?

Baidu Encyclopedia-Omron Ring?