LPT: /L-P-T/ or /lip'it/ or /lip-it'/ n. 1. Line printer
(originally Line Printing Terminal). Rare under Unix, more common
among hackers who grew up with ITS, MS-DOS, CP/M and other operating
systems that were strongly influenced by early DEC conventions.
2. Local PorT. Used among MS-DOS programmers (and so expanded in
the MS-DOS 5 manual). It seems likely this is a backronym.