R means registration. The abbreviation of "register" in English. When goods or services are marked with this mark, it tells people that the graphics or words marked are not only trademarks, but also trademark registration. They are protected by national laws and can not be used by any other individuals and organizations without authorization. A trademark is a mark used to distinguish the brand or service of an operator from the goods or services of other operators.

In mathematics, the letter "R" represents the set of real numbers or the radius of a circle; One of the 26 letters in English is a consonant; Represent the registered official trademark in the goods; Represents resistance in physics; In physical chemistry, it also represents ordinary gas constant - molar gas constant; Indicates right in azimuth; Represents a mathematical programming language in the computer field; Represents a reverse gear in the vehicle.

Source: @emede.exe