Source : Free On-Line Dictionary of Computing

LPT
     
        /L-P-T/ or /lip'it/ or /lip-it'/ Line printer.  Rare under
        {Unix}, more common among hackers who grew up with {ITS},
        {MS-DOS}, {CP/M} and other {operating system}s that were
        strongly influenced by early {DEC} conventions.
     
        [{Jargon File}]