Based on the common naming conventions for digital media, the "complete" text you are likely looking for is:
: This usually stands for Line Dubbed , meaning the audio was taken from a direct source (like a headphone jack in a theater) rather than the digital master, though in modern encodes, it is sometimes used to indicate "Lien Direct."
What these terms mean:
: This refers to a high-definition video file that has been compressed to a smaller file size while trying to maintain 1080p quality.