: 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."

Based on the common naming conventions for digital media, the "complete" text you are likely looking for is:

: This refers to a high-definition video file that has been compressed to a smaller file size while trying to maintain 1080p quality.

: This indicates the movie uses the official French theatrical dubbing , rather than a "VFF" (Version Française Faite au Québec) or an unofficial fan dub.

What these terms mean: