DRL is spelled using the phonetic transcription "di ɑr ɛl." It is an acronym that stands for "daytime running lights," which are headlights that automatically turn on whenever a car is in operation during daylight hours for increased visibility and safety. The spelling uses the letter "D" for "daytime," followed by the sound of "R" and "L" for "running lights." The IPA phonetic transcription helps to show the exact sounds of each letter in the word.