The origin of Rx, used as an abbreviation for prescription, has been attributed to the Latin word recipe which means take. Also, it has been associated with Jupiter, the chief deity of Roman state religion until Christianity became the dominant religion of the Roman Empire.
What is the VIN number? It is the same as your car registration number, but in some instances can be referring to your actual plate number you are assigned when registering the vehicles VIN number. This number is specially individualized for each car.
Isn't numero de placa the license plate number? The VIN is a much more elaborate number that encodes the manufacturer (Honda/Ford/Volkswagon) the model and the particular automobile and is about 15-20 digits long (maybe, alfanumeric, I don't remember). 00e657d4. I think the VIN number is not implemented in all countries. By example, we don't have an equivalent in Argentina. There we use the chassis and motor serial numbers to identify a vehicle. Imported cars may have it, but not the ones manufactured there.