PD, P.D., or Pd may refer to:
The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a succession of products in the PDP series.
Digital Equipment Corporation's PDP-10, later marketed as the DECsystem-10, was a mainframe computer family manufactured beginning in 1966; it was discontinued in 1983. 1970s models and beyond were marketed under the DECsystem-10 name, especially as the TOPS-10 operating system became widely used.The PDP-10's architecture is almost identical to that of DEC's earlier PDP-6, sharing the same 36-bit word length and slightly extending the instruction set (but with improved hardware implementation).
The PDP-8 was a 12-bit minicomputer produced by Digital Equipment Corporation (DEC). It was the first commercially successful minicomputer, with over 50,000 examples being sold over the model's lifetime.
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Petróleos de Venezuela, S.A. (PDVSA, Spanish pronunciation: [peðeˈβesa]) (English: Petroleum of Venezuela) is the Venezuelan state-owned oil and natural gas company.
The PDC World Darts Championship, known for sponsorship purposes as the William Hill World Darts Championship, organised by the Professional Darts Corporation (PDC), is one of the two separate World Professional Darts Championships held annually in the sport of darts.
PDCA (plan–do–check–act or plan–do–check–adjust) is an iterative four-step management method used in business for the control and continuous improvement of processes and products.