What abbreviation would you find associated with a vehicle's tail light?

The abbreviation commonly associated with a vehicle's tail light is TL. This abbreviation is simple and widely recognized within the automotive industry, directly indicating the component's function as a tail light. Using abbreviations like TL helps streamline communication in inspections and repairs, allowing professionals to quickly identify specific parts of a vehicle without lengthy descriptions.

Other options, while they might seem plausible, are not standard abbreviations for tail lights. TR might refer to other components, and TLGT or TAILLT are not commonly used in industry standards or documentation. Hence, TL stands out as the correct choice, as it is succinct and effectively communicates the necessary information regarding the tail light.