(PGA) A style of integrated circuit socket or pin-out with pins laid out on a square or rectangular grid with a separation of 0.1 inch in each direction. The pins near the centre of the array are often missing.
PGA is often used on motherboards for processors, e.g. Socket 6 and Socket 8.
PPGA is "plastic PGA" (as opposed to ceramic?).
See also SPGA.