RC in the context of vehicles can have two different meanings:
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Registration Certificate (RC): A vehicle registration certificate is an official document providing proof of registration of a vehicle. It is used primarily by governments as a means of ensuring that all road vehicles are on the national vehicle register, but is also used as a form of law enforcement and to facilitate change of ownership when buying and selling a vehicle.
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Radio-controlled (RC) car: Radio-controlled cars (or RC cars for short) are miniature model cars, vans, buses, trucks, or buggies that can be controlled from a distance using a specialized transmitter or remote. The term "RC" has been used to mean both "remote controlled" and "radio-controlled". RC cars are powered by one of three energy sources - electricity, nitro fuel, or petrol. Electric RC models are powered by small but powerful electric motors and rechargeable nickel-cadmium (Ni-Cd), nickel metal hydride (NiMH), or lithium polymer (LiPo) cells with the former two being the most used.
In summary, RC can refer to either a vehicle registration certificate or a radio-controlled car.
