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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/Windows programmers (and so expanded in the MS-DOS 5 manual). It seems likely this is a backronym.

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