LD

  1.  Sometimes abbreviated as LD, a LaserDisc is an 8" to 12" wide disc that is capable of containing full-motion video and audio. Today, LaserDiscs have been widely replaced by DVD.
  2. Linux command, see the ld command page for additional information on this command.
  3. LD is also chat slang for Long distance.

Also see: Laser, Chat slang