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 for programmable interrupt controller
From The Free On-line Dictionary of Computing (30 December 2018) :

  Programmable Interrupt Controller
      PIC A special-purpose integrated
     circuit that functions as an overall manager in an
     interrupt driven system.  It accepts requests from the
     peripheral equipment, determines which of the incoming
     requests is of the highest priority, ascertains whether the
     incoming request has a higher priority value than the level
     currently being serviced, and issues an interrupt to the CPU
     based on this determination.
     PICs typically have eight interrupt lines, and two PICs are
     often cascaded to provide 15 available interrupt lines.
     See also: Advanced Programmable Interrupt Controller.

Contact=webmaster@dict.org Specification=RFC 2229