Cars driving in many different countries of the world have 2 or 3 letter abbreviations for their country on the back of their cars. I will give you the abbreviations. Name the country. a. D b. E c. CH

The letter codes seen on vehicles crossing international borders are officially known as distinguishing signs of the State of registration, and they were established to easily identify a car's country of origin. The system was first introduced in 1909 and has been updated by later treaties like the Geneva Convention on Road Traffic of 1949 and the Vienna Convention on Road Traffic of 1968. These codes, consisting of one to three letters, are maintained by the United Nations. While many countries now incorporate this code into their standard license plates, such as on the blue strip of EU plates, others still require a separate white oval sticker on the rear of the vehicle.

The specific letters often derive from the country's name in its native language. For instance, the "D" on German cars stands for "Deutschland," the German word for Germany. Similarly, the "E" seen on Spanish vehicles represents "España," the Spanish name for Spain. These codes provide a standardized method for authorities and other drivers to recognize a vehicle's origin, which is crucial for law enforcement and regulatory compliance in international traffic.

Perhaps the most intriguing of the three is Switzerland's "CH" designation. These letters do not correspond to the country's name in any of its four official languages (German, French, Italian, or Romansh). Instead, "CH" is an abbreviation for the country's Latin name, "Confoederatio Helvetica" (Helvetic Confederation). The use of a neutral Latin name was a deliberate choice to avoid showing preference for any one of its national languages and cultures. Unlike many of its European neighbors, Switzerland does not integrate the "CH" into its standard license plates, meaning a separate sticker is mandatory for Swiss vehicles when traveling abroad.