LPD

LPD is an acronym that can refer to several concepts, with two widely used meanings in technology and manufacturing.

Line Printer Daemon refers to a network printing protocol and the software that implements it, enabling remote submission of print jobs to printers over a network. It originated in the BSD Unix printing system and was formalized in the RFC 1179 standard. The protocol typically uses port 515 and is implemented by spoolers such as lpd, which manage print queues and handle job submission and control. Many modern systems provide LPD compatibility through interoperability layers or complete suites like CUPS or LPRng, though IPP-based printing has become more common for enhanced features and security.

Low-Pressure Die Casting is a metal casting process that uses low gas pressure to force molten metal into a die cavity. It is commonly used with aluminum and magnesium alloys to produce components with good dimensional stability, smooth surface finish, and reduced porosity compared to high-pressure methods. The process supports complex geometries and thin walls, making it suitable for automotive parts, housings, and other precision components. Trade-offs include longer cycle times and higher equipment costs, but the method offers advantages in part quality and precise fill control.

Other uses of the acronym exist in different domains, but Line Printer Daemon and Low-Pressure Die Casting are among the most common references in technology and manufacturing.